Abstract: A brake assembly for use with a retractable lifeline assembly comprises a brake hub, a pressure plate, a first friction disk, a brake plate, a second friction disk, and a lock nut. The brake hub includes a flange extending outward from an at least partially threaded shaft. The pressure plate is positioned on the at least partially threaded shaft proximate the flange. The first friction disk is positioned on the at least partially threaded shaft proximate the pressure plate. The brake plate is positioned on the at least partially threaded shaft proximate the first friction disk. The second friction disk is positioned on the at least partially threaded shaft proximate the brake plate. The lock nut is threaded onto the at least partially threaded shaft, and the lock nut is set to a desired torque at which the brake plate slips prior to final assembly of the retractable lifeline assembly.

Abstract: A passive fire suppression system including at least one tapered cellular glass block and having a cap with a tapered shape disposed on the top of the at least one cellular glass block. The passive fire suppression system allows drainage from the upper surface to the bottom of the system. The drainage is beneficial for both environmental conditions such as rain as well as for incidents where combustible liquids are spilled on the top surface of the system. Therefore, the system will not only shield any combustible materials that are under the system but will also quickly drain any combustible liquids that may spill onto the top of the system to the lower surface.

Abstract: A smoke eliminator device is provided. The smoke eliminator device is especially suitable for removing smoke from a room or building so as to allow a firefighter to more easily rescue individuals and extinguish fires. The device is a lightweight elongated tube which connects to a standard fire hose. Water emitted from the distal end of the device creates a suction which pulls smoke out of the room or building. A glass-breaking device is located near a distal end of the device to allow the device to easily penetrate a window wherein it may be effective. A cooling nozzle allows for the extinguishing of fire by water spray. An extension may be added to the device to allow the device to be utilized in the upper floor of a building. The device may further have a bend which allows a user to utilize the device directly below a window of an upper floor.

Abstract: An exercise desk that includes a peripheral skirt having multiple corners; a plurality of rigid legs with one leg for support at a corner of the peripheral skirt; and a planar top work surface member supported by and over the peripheral skirt, and forming a desk work surface. The peripheral skirt is arranged with a front recessed cut-out section for accommodating a user of the exercise desk. The cut-out section is defined at least in part by opposed facing skirt walls. The desk also includes exercise elements in the form of a pair of parallel bars mounted respectively from the opposed facing skirt walls and accessible to the user of the exercise desk and a pull-up bar having opposed ends that are supported from the planar top work surface member adjacent respective opposed facing skirt walls.

Abstract: A retractable exercise band system is described. The retractable exercise band system may include at least one strap configured to be worn around a user's limb, a tube connected to the at least one strap and comprising a hollow interior, and an elastic band. The elastic band extends through the tube interior and may include a band top end connected to a handle configured to be grasped by a user's hand, and a band bottom end located below the tube bottom end. The retractable exercise band system is configured to remove from a collapsed position in which the handle is located a first distance from the tube top end to an extended position in which the handle is located a greater distance from the tube top end.

Abstract: An exercise system comprises an anchor and at least one extendible tether extending from a mooring on the anchor to a grip end. Each extendible tether is longitudinally movable between an extended configuration and a retracted configuration. At least one sensor alignment arm is movably coupled to the anchor, and a sensor is associated with each sensor alignment arm and extendible tether. The sensor alignment arm carries a first sensor element and the extendible tether carries a second sensor element. Each extendible tether is longitudinally movable relative to its sensor alignment arm and angular movement of the extendible tether relative to the anchor moves the sensor alignment arm to maintain longitudinal alignment between the first sensor element and the second sensor element. The sensor detects movement of the second sensor element past the first sensor element as the extendible tether moves between the extended configuration and the retracted configuration.

Abstract: A system, and method, for training athletes to increase power is provided in a flexible barbell for enhancing weight lifting exercises. The flexible barbell has an elongated shape comprising ends. At least one flexible bar may be included when an elongated shape with a center is used. Weights are attached to the shape near the ends. The shape bends relative to a tangent to the center in response to the center of the flexible barbell being moved.

Abstract: A locking mechanism for a shaft provides secure frictional engagement to the shaft while manually operable to be removed from the shaft. There is a first cylinder allowable to slide freely on the shaft. One or more holes retaining one or more balls allow a projection of the balls into an interior of the first cylinder. A tensioning ring (second cylinder) partially overlaps the first cylinder, retains the balls within the holes, and has at least a portion of the inside diameter increasing in diameter. A biasing mechanism acts against the second cylinder to urge the balls into the first cylinder interior to frictionally engage the shaft. Two release mechanisms movable with the biasing mechanism manually actuated against the bias move the second cylinder to allow the balls to freely move within the holes and the locking mechanism to be slid onto and removed from the shaft.

Abstract: An adjustable-weight exercise device includes a body having a through-hole; a handle centrally located in the body and disposed within the through-hole; and at least one internal compartment having a number of insertion slots therein, each adapted to receive a weight. The device may include a covering member disposed over each of the internal compartments, each fastened to the body. The adjustable-weight exercise device may be employed in a variety of physical activities to seamlessly move from one desired position or movement to the next without inconvenience or interruption.

Abstract: An apparatus for strengthening arm muscles, including a framework, a tabletop on the framework, an elbow pad and a touch pad on the tabletop. A hinged lever with a handle is coupled to a horizontal shaft, which in turn is coupled to a vertical shaft. A grooved wheel is disposed on the vertical shaft under the tabletop, and a wire is laid in the groove of the wheel. One end of the wire is fixed to the wheel and the other end of the wire is detachably fixed to a counterbalance weight, so that when the counterbalance weight is in a lower extreme position, the lever is in an initial position, and when the lever is in a reclined position, the counterbalance weight is in an elevated position relative to its lower extreme position.

Abstract: A portable exercise device designed to efficiently and safely target and isolate the gluteal, hamstring and calf muscles, which are the posterior muscles of the lower body, while limiting the use and over training of the quadriceps (thigh) anterior muscles of the lower body. The exercise device is an inclined platform with an additional raised support, providing resistance originating from within the platform, which optimizes the eccentric phase of every squat and lunge for maximal strength and hypertrophy of the muscles. The combination of the inclined platform with additional raised support places the user into an optimal position for exercising the posterior muscles of the lower body.

Abstract: An exercise machine includes a frame, a first rotary mechanism supported on the frame, a second rotary mechanism rotatably engaging with the first rotary mechanism, and a driving mechanism operatively coupled to the second rotary mechanism and configured to impart rotation of the second rotary mechanism while the driving mechanism is being actuated. The second rotary mechanism is hubless. The second rotary mechanism is configured to absorb and retain an amount of the actuation of the driving mechanism as a moment of inertia while the second rotary mechanism rotates.

Abstract: An exercise device includes a linkage assembly that links a driving member to a driven member such that circular rotation of the driving member causes generally equal circular rotation of the driven member. The linkage assembly includes a linking member, a first crank arm that connects the driving member to the linking member such that rotation of the driving member causes motion of the linking member, and a second crank arm that connects the linking member to the driven member such that the motion of the linking member causes rotation of the driven member. At least one additional crank arm connects the linking member at a rotational axis that is laterally offset from a straight line through the first and second crank arm rotational axes.

Abstract: A device useful for exercise having a collapsed and an upright exercise position, the device comprising a collapsible lower frame and a collapsible upper frame. The lower frame has lower frame posts pivotably connected to a base structure. The lower frame post upper portions are linked together by a linking structure such that the lower frame posts form a pyramid structure in the lower frame upright exercise position. The collapsible upper frame has a upper frame posts pivotally connected to a top structure. The upper frame post lower portions are linked together by the linking structure such that the upper frame posts form an inverted pyramid in the upper frame upright exercise position. The linking structure connects the upper frame to the lower frame such that the upper frame can pivot relative to the lower frame when the device is in its upright exercise position.

Abstract: This invention relates to training apparatuses for the trunk musculature. The training apparatuses are characterized in particular in that the spinal erectors and the abdominal muscles can be trained. To this end, a frame has a sitting device with a seat for unrestrained sitting without contact with the floor, at least one backrest, a first fixing device for the pelvis, and at least one second fixing device for an arm or a hand. Furthermore, the seat including the coupled first fixing device is movable relative to the backrest including the second fixing device. The movable seat including the first fixing device and the backrest including the second fixing device advantageously result in the pelvis being movable while the upper body remains steady. The frame is configured so that the feet or the legs cannot support the upper body.

Abstract: A variable-color region (106) of an information-presentation structure extends to an exposed surface (102) at a surface zone (112) and normally appears along it as a principal color. An impact-dependent portion (138) of the variable-color region responds to an object (104) impacting the zone at an object-contact area (116) by temporarily appearing along a print area (118) of the zone as generic changed color materially different from the principal color. The print area closely matches the object-contact area in size, shape, and location. The colors are chosen to accommodate persons who are color blind. One of the principal and changed colors is usually restricted from being any color from green to red in the visible light spectrum or any color having a non-insignificant component of any color from green to red in the light spectrum for accommodating persons having the predominant red-green color blindness.

Abstract: A monofin, for use in swimming, includes a fin shaped like a whale tail, wherein the fin further includes a leading edge and a trailing edge. At least one corrugation is formed in the fin, wherein the at least one corrugation is parallel to a portion of the leading edge. At least one foot pocket assembly may be removably coupled to the fin. The at least one foot pocket assembly includes a foot pocket cover formed to removably couple around a portion of the fin. At least one foot opening is formed in the foot pocket cover and at least one cuff surrounds the at least one foot opening. At least one foot pocket is in communication with the at least one foot opening. The at least one cuff stretches to encompass an ankle of users of many sizes and holds the monofin on the users.

Abstract: A golf ball including a core; an inner cover layer formed from a thermoplastic composition and having a thickness of about 0.005 inches to 0.40 inches and a surface hardness of about 60 Shore D or greater; and an outer cover layer formed from a thermoset material and having a thickness of about 0.01 inches to 0.05 inches and a surface hardness of about 60 Shore D or less. The thermoplastic composition has a first melt flow index at 280° C. under a 10-kg load of less than about 35 g/10 min and a second melt flow index at 265° C. under a 5-kg load of less than about 10 g/10 min.

Abstract: The present invention provides a method for arranging dimples on a golf ball surface in which the dimples are arranged in a pattern derived from at least one irregular domain generated from a regular or non-regular polyhedron. The method includes choosing control points of a polyhedron, generating an irregular domain based on those control points, packing the irregular domain with dimples, and tessellating the irregular domain to cover the surface of the golf ball. The control points include the center of a polyhedral face, a vertex of the polyhedron, a midpoint or other point on an edge of the polyhedron and others. The method ensures that the symmetry of the underlying polyhedron is preserved while minimizing or eliminating great circles due to parting lines.

Abstract: The present invention provides a method for arranging dimples on a golf ball surface in which the dimples are arranged in a pattern derived from at least one irregular domain generated from a regular or non-regular polyhedron. The method includes choosing control points of a polyhedron, generating an irregular domain based on those control points, packing the irregular domain with dimples, and tessellating the irregular domain to cover the surface of the golf ball. The control points include the center of a polyhedral face, a vertex of the polyhedron, a midpoint or other point on an edge of the polyhedron and others. The method ensures that the symmetry of the underlying polyhedron is preserved while minimizing or eliminating great circles due to parting lines.

Abstract: The present invention is a golf ball which comprises dimples having a cross section defined by the superposition of two or more continuous and differentiable functions, and particularly the superposition of a spherical curve and a cosine curve. Additionally, the dimples preferably have a circular boundary and maintain an axis coincident with the center of the circular boundary.

Abstract: A golf ball having formed therein a hit line for making a fade shot or a draw shot, and a manufacturing method therefor and, more specifically, to a golf ball having formed therein a hit line for making a fade shot or a draw shot, and a manufacturing method therefor, the golf ball having a balance line, a fade line, and a draw line formed on the outer surface of the golf ball to thus unify a golfer's intended direction and the flying direction of the golf ball if a driving shot or a putting shot is made, thereby enabling putting with a precise hit and enabling a fade shot or a draw shot to be more effectively made.

Abstract: A golf ball has an inner core layer including a thermoplastic highly-neutralized ionomer and having a geometric center hardness less than a surface hardness to define a first positive hardness gradient. An outer core layer is formed about the inner core and includes a homogenous thermoset composition. The outer core has an interior hardness less than an outer surface hardness to define a second positive hardness gradient. An inner and outer cover layers are disposed about outer core layer. The first and second hardness gradients each have a slope and the slope of the second hardness gradient is less than the slope of the first hardness gradient such that a ratio of the first and second slopes is 0.8 to 0.85.

Abstract: Multi-layered golf balls having at least one layer made of a polyester composition containing a polyester thermoplastic elastomer and plasticizer are provided. The plasticizers help reduce the glass transition temperature (Tg) of the composition and various plasticizers may be used. For example, the composition may include alkyl oleate plasticizers such as ethyl oleate and octyl oleate. Polyester-ether block copolymers are particularly preferred. The golf ball includes a core having at least one layer and a cover having at least one layer. The polyester composition may be used to form any core, cover, or other layer in the golf ball.

Abstract: Disclosed herein are multilayer golf balls having a layer with a higher Shore C hardness and a lower Shore D hardness than another layer.

Abstract: Golf ball having at least three layers comprising an ionomeric and/or HNP composition, wherein for each two adjacent layers, a relationship is established between a ratio of the volumes of the two adjacent layers and a ratio of the percent neutralizations of those two layers such that the volumes and % neutralizations of all layers are interrelated and interdependent to produce unique and desirable playing characteristics. In one embodiment, each of T layers, wherein T?3, has a different volume “V” and comprises an ionomeric/HNP composition having a different % neutralization “N”; and wherein each of n inner layers of the T layers (n<T) has an adjacent surrounding layer n+1 such that a volume Vn and a % neutralization Nn of each inner layer and a volume V(n+1) and % neutralization N(n+1) of each adjacent surrounding layer n+1 satisfy the relationship (V(n+1)?Vn)/V(n+1)?(N(n+1)?Nn)/Nn.

Abstract: A ball includes a first housing, at least six light emitting structures, a woven structure, and a second housing. The light emitting structures are symmetrically disposed on the first housing. Each light emitting structure includes a fixing unit, a light emitting unit, and a first light permeable unit. The fixing unit is disposed on the first housing. The light emitting unit is located between the fixing unit and the first light permeable unit. The woven structure includes a plurality of woven units, which are at least partially overlapped and covering the first housing. The second housing covers the woven structure and includes a first material layer, a second material layer, and at least six second light permeable units. The first material layer covers the second material layer. The second light permeable units are disposed on the second material layer corresponding to the positions of the light emitting structures.

Abstract: A stand-alone putter structured and weight balanced enabling the putter to stand upright in a favorable lie and loft position on a putting surface without any outside support formed of a club head, a shaft connected to the club head, and having a gripping area at the upper end of the shaft. The club head is conventional in design and includes a ball striking face, a rear surface, a heel, a toe, an upper surface and a bottom sole structured to serve as a first ground support surface for the putter in a conventional use position with the bottom sole lying on a putting surface. The club head further includes at least one additional ground engaging support member extending outwardly from the club head forming a second ground support member to maintain the putter in a stand-alone position on the putting surface.

Abstract: A ball striking device, such as a golf club head, has a face member with a striking surface configured for striking a ball and a flange that comprises a portion of the crown. The flange being made of at least two members that are made of different materials, where a second material has a lower modulus of elasticity than the first material. The second member has a length, a width, a thickness and a location proximate to the ball striking surface to improve the impact efficiency of a collision with a golf ball.

Abstract: Golf clubs and/or golf club heads include a club head body defining an interior chamber, structure for engaging a shaft with the body, and/or a shaft engaged with the body. The club head body may have an overall length of at least 4.5 inches and an overall breadth of at least 4.2 inches. In other examples, the club head body may have an overall length of at least 4.6 inches and a ratio of the overall breadth dimension to the overall length dimension of 1 or less. If desired, the ratio of the head breadth to head length dimensions may be in a range from at least 0.94 to 1 or less.

Abstract: Golf club heads with internal and/or external ribs, and thinned regions are described herein. The thinned regions of the golf club heads can be strategically positioned such that club head weight is reduced in certain regions to optimize center of gravity (CG) location; while the internal and/or external ribs prove the structural strength the golf club heads require to withstand impact forces during a game. The discretionary weight saved from the thinned regions can be repositioned elsewhere on the golf club head to further optimize the CG location to benefit the moment of inertia to effect ball spin, speed, distance, and trajectory. Other embodiments and related methods are also disclosed herein.

Abstract: A high forgiveness wood-type golf club head comprises a body and a face. The body comprises a sole that forms a bottom portion of the golf club head, a crown that forms a top portion of the golf club head and a skirt that forms a periphery of the golf club head between the sole and the crown. The face place is positioned at a front portion of the golf club head opposite a rear portion of the golf club head. The body defines an outer periphery having a generally triangular shape in plan.

Abstract: A golf club head includes a metallic front body coupled with a rear body to define a substantially hollow structure. The metallic front body includes a strike face and a surrounding frame that extends rearward from a perimeter of the strike face. The rear body includes a crown member and a sole member coupled to the crown member. The sole member comprises a structural layer formed from a filled thermoplastic material and a fiber reinforced composite resilient layer bonded to an external surface of the structural layer. The structural layer includes a plurality of apertures extending through a thickness of the structural layer, and the resilient layer extends across each of the plurality of apertures. The structural layer and the resilient layer each include a common thermoplastic resin component, and are directly bonded to each other without an intermediate adhesive.

Abstract: Golf clubs according to at least some example aspects of this disclosure may include a golf club head and a shaft configured to engage with the golf club head which includes a grip engaged with the shaft. Further, the golf club may include a monitoring device, which includes a sensor and a transmitter. Additionally, the monitoring device may be configured to determine data related to the characteristics of a golf swing. Further, the monitoring device may be configured to transmit the data related to the characteristics of a golf swing to a remote computer.

Abstract: A putter-type golf club head and method of manufacturing said golf club are herein disclosed. The putter has a body, a face surface, a rear surface, a sole surface, a crown surface, and a heel surface. To reduce the reflective glare off the crown surface and to improve the ease of alignment, the putter includes various curved boundaries between surfaces of the club head. Multiple sections of the crown connect with the heel surface through curved transition regions, which reflect the light differently than the crown surface and thus serve as alignment aids.

Abstract: A golf club (2) comprising a shaft (20), a head and a damping device (1, 100). The damping device (1, 100) includes an anchor element (3, 103) and a damping element (4, 104) interconnected by a rigid rod (5, 105). The anchor element (3, 103) is anchored within the lower section of the shaft (20) that has a substantially constant diameter such that the damping element (4, 104) is in contact with an internal surface of the shaft (20) to dampen vibrations therein.

Abstract: An club marking cloth comprised of a square piece of material. In at least one corner of the material a powerful magnet is attached. The powerful magnet allows the club marking cloth to be attached to the metal head of a golf club. The club marking cloth can be either attached to clubs left in the golf bag to indicate that clubs have been removed, or, can be attached to the head of clubs left in the grass so that the club is easier to see and find for the golfer.

Abstract: A divot repair tool includes a main body having an internally located prong assembly having one or more prongs. The prongs selectively transition between an extended and retracted position. At least one of the elongated prongs include a top end having a generally teardrop shape.

Abstract: A golf green repair tool having a plurality of spears centered around a plurality of tines. The tines and spears are biased by a spring inside a housing and sleeve. When the cap the housing is pressed by the foot of a greenskeeper or golfer the spring is compressed forcing the tines and spears into the turf. The tines are inserted around the periphery of the ball-mark to aerate and loosen the turf. The spears are inserted into the center of the ball-mark and aerate and pull the bottom of the ball-mark to the level of the surrounding turf. The bottom side of the ground-contacting sleeve pressed down the raised rim of the ball-mark correcting the entire ball-mark to the level of the surrounding turf.

Abstract: Included are systems and methods for providing data. At least one embodiment of a method includes constructing, by a computing device, a segment line on a computer display of an image of a golf course, the segment line being constructed from a tee box on a golf hole to a green on the golf hole, the segment line bisecting a fairway of the hole; determining at least one lay up position on the segment line, the at least one lay up position indicating a predetermined distance from the green; and providing the at least one lay up position to a user device, the user device configured to determine a distance between the user device and the lay up position.

Abstract: A sporting good implement, such as a hockey stick or ball bat, includes a main body. The main body may be formed from multiple layers of a structural material, such as a fiber-reinforced composite material. One or more microlattice structures may be positioned between layers of the structural material. One or more microlattice structures may additionally or alternatively be used to form the core of a sporting good implement, such as a hockey-stick blade. The microlattice structures improve the performance, strength, or feel of the sporting good implement.

Abstract: Provided is a handheld dexterity training technology. In one example a handheld dexterity training device comprises two portions that are rotatable relative to one another about the axis of rotation of a twisting joint that connects them together. One portion comprises a handle while the other portion comprises a panel having a playing surface that can be used to strike a ball to make it bounce. A stopper prevents rotation beyond a certain angular range. The rotatability of the handle relative to the playing surface poses a particular challenge. A releasable lock can bind the two portions together. Other features and components are possible. A method of dexterity training is also provided.

Abstract: Embodiments of golf club heads with sole cavity ports are described herein. Other examples and related methods are also disclosed herein.

Abstract: A throw weight includes a handle and a bag rotatably associated with the handle. The bag is designed to hold a weight which can be interchanged with other weights. The bag and handle are particularly constructed and oriented relative to one another for the purpose of correctly stabilizing the weight and to facilitate ease of throwing. The bag may include an opening at an end of the bag opposite the handle.

Abstract: The inventions disclosed herein relate to designs of climbing surfaces, fall safety pads and/or accessories related thereto. According to some embodiments, different impact zones of a fall safety pad can have different cushioning attributes. The different cushioning attributes of the different impact zones of the safety pad can be based on a vertical distance to a directly overlying portion of the climbing surface. The different cushioning attributes of the different impact zones of the safety pad can also consider a predicted or measured frequency of falling from a portion of the climbing surface directly overlying each impact zone of the safety pad. Other intended climber attributes, enjoyment, and safety concerns can be considered in the design of the climbing surface(s), safety pad(s), and accessories disclosed. Further, wear, replicability, customizations of enjoyment, and updates to safety concerns in the climbing sport are further understood in view of this disclosure.

Abstract: A multi-height baseball hitting device includes a base plate assembly, a sleeve and a pipe. The sleeve is disposed on the base plate assembly. The sleeve has at least three positioning blocks extending from an inner wall of the sleeve. The pipe has a supporting portion, a connecting portion and a positioning portion. The supporting portion is connected with the connecting portion for supporting a ball. A plurality of ring-shaped rails are formed on the positioning portion and arranged from the connecting portion at equal intervals, and the positioning blocks of the sleeve are engaged with the ring-shaped rails, such that the pipe is adjustable to be fixed with plural heights, thereby meeting all of the heights of children and adults.

Abstract: A striking device features an attachment mechanism releasably coupled to a length of cord for suspension of the device from an upper support. Featured along the cord is a mechanism for height adjustment, designed for insertion and removal from within the interior of a hollow striking object. The striking object remains attached to the height adjustment mechanism when struck, but is quickly detached by application of a force downward upon the top of the striking object. The entire device is designed for rapid assembly and disassembly and such that it is suitable for use within a home with lesser space requirements than other training devices on the market.

Abstract: An adjustable support for a speed bag includes a base and a telescoping support column. The column is pivotably connected to the base and movable between a folded position and a deployed upright position. The support further includes a cantilever arm having a first end pivotably connected to an upper column portion of the column, and a speed bag platform is secured adjacent a second end of the cantilever arm. The cantilever arm is movable between a first folded position and a second cantilever position. A platform locking mechanism releasably secures the cantilever arm in the second cantilever position, whereby the pivoting and telescoping column and the pivoting cantilever arm and speed bag platform allow the speed bag to be deployed and used at a plurality of heights and orientations.

Abstract: A swivel joint system for hanging a heavy punching bag from an overhead support has a swivel joint defining at least first and second perpendicular pivot axes and a hanging shaft having a lower end pivotally connected to the universal joint for rotation about the first pivot axis and an upper end configured for rotatable attachment to an overhead support for free rotation about a third pivot axis. A hanging tube is pivotally connected to the universal joint for rotation about the second pivot axis, and releasably secured to a mounting plate. A plurality of attachment members are rigidly attachable at spaced locations around the mounting plate to surround the hanging tube and configured for attachment to straps at the upper end of a heavy punching bag.

Abstract: A training aid includes a frame configured for mounting on a head of a user and a light indicator coupled to the frame. The light indicator includes a light source configured to generate a beam of visible light extending away from the light source. The light indicator includes a first casing segment pivotally coupled to the frame and a second casing segment pivotally coupled to the first casing segment, wherein the light source is disposed in the second casing segment. The light indicator further includes an inclinometer configured to control operation of the light source depending on a tilt angle of the light indicator.