Special Features:

Input keys 3; 2.000 in.Dia polished phenolic ball 1; padded hand support; interface cable; instruction manual; instant cursor speed control; storage temp range: minus 4.0/plus 184.0 degrees f; power source: external; reference data, 17, ti-6315.1, fa 10347, terminal doppler weather radar, (tdwr), system, vol 1, sec 1-10, pg 8-7

Properties:

A device which includes a sphere mounted in a small open-topped box. The sphere is hand-operated by rotating it in a backward, a forward, or a sideway direction while maintaining the device in a fixed location. The movement of the sphere generates a signal which may be used to move a cursor and/or tracking symbol on the face of a display, such as a cathode ray tube; to input data into an electronic system; and/or to control the operation of a system. It may or may not include additional input devices, such as switches or variable resistors.