Abstract: A wrist protector includes a protector body having a flexible base member defining therein an accommodation chamber and a fastening structure adapted for fastening the flexible base member to a user's wrist, and a hard support plate detachably set in the accommodation chamber of the flexible base member to give support to the user's wrist. The hard support plate is orthopedically engineered, having opposing first positioning portion and second positioning portion and a high-rise portion connected between the first positioning portion and the second positioning portion and defining a high-rise space therebelow. Different heights of hard support plates can be selectively used with the protector body to fit different users, enabling the user to operate a computer keyboard or mouse comfortably for a long period of time without causing pain.

Abstract: An operation control device includes a housing, a control module having a movable operating device carried on a carrier frame in the housing and partially exposed to the outside and rotatable and axially slidable by the user, a circuit module, which includes a rotation sensor module for sensing the direction and amount of rotation of the movable operating device and producing a respective control signal and magnetic sensors for sensing the direction and amount of axial displacement of the movable operating device in a non-contact manner. The human-friendly design of the operation control device facilitates cursor control, assuring high operation stability and comfort.

Abstract: A control device includes a base frame, a bearing board hinged to the base frame at the top for holding an electronic device, a bracket hinged to the bearing board for supporting the bearing board on the base frame in a sloping position, a trackball device mounted in a front recess of the base frame in front of the bearing board and carrying a rolling bar in a rolling chamber thereof for rotating or moving by the user and a circuit module with a sensor module for sensing the direction and amount of rotation or displacement of the rolling bar and outputting a corresponding signal and a connection interface module for transmitting the output signal from the sensor module to the electronic device to control the cursor on the display screen of the electronic device.

Abstract: A cursor control device is disclosed to include a hollow elongated circuit module holder having a top opening, a sleeve sleeved onto the circuit module holder and movable leftwards and rightwards and rotatable forwards and backwards relative to the circuit module without friction and a circuit module accommodated in the circuit module holder and adapted for sensing the direction and amount of movement of the sleeve relative to the circuit module holder and producing a signal indicative of the direction and amount of movement of the sleeve relative to the circuit module holder for controlling a cursor on a display screen of an electronic device.