Abstract: A power supply device for a rotary distance detection device of a robot vacuum cleaner includes a base having a control board which is electrically connected to a power supply so as to control the base to move. The control board has bearings and a distance-detection circuit board on the bearings. The distance-detection circuit board is electrically connected to the control board and the power supply via the bearings so that the robot vacuum cleaner is able to work continuously without worry of replacement of batteries.

Abstract: A laser level assembly includes a base kit and an adjustment unit which is pivotably connected to the base kit. The adjustment unit has a block, a pivotable member, multiple shafts and multiple bearings. The shafts extends through the bearings and the block such that the block is pivotable relative to the connection member of the base kit, and the pivotably member is pivotable to the block. The pivotable member is connected to the laser level. The pivotable member is pivotable about an axis that is perpendicular to the pivotable axis of the connection member. The laser level is always maintained at a position that the laser beam is parallel to a desired plane.

Abstract: A measuring device includes a laser rangefinder, a retractable tape measure and a connecting assembly. The laser rangefinder is configured to transmit a light pulse to a target and receive a reflected light pulse from the target for measuring the distance between the rangefinder and the target. The tape measure has a housing and a flexible measuring tape enclosed in the housing. The housing defines a tape outlet opening from which the measuring tape is movable from a retracted position to an extended position. The connecting assembly is disposed at the junction between the laser rangefinder and the tape measure to have the laser rangefinder and the tape measure be detachably mounted together.