Special Features:

Model b - sunmd, sun mouse-trak professional trackball, 1200 baud synchronous with double shielded 60" cable; material is abs, beige and injection molded vinyl, grey hand pad; ball material is cast phenolic resin and rockwell h85 hardness; 8-pin mini-din male connector

Properties:

A pointing device, which when moved in any direction on a flat surface, generates a signal to move a cursor and/or tracking symbol on a display device. it may include buttons or wheels that allow the user to select operations and manipulate text and graphics. includes spherical, optical, wireless mouses and the like. excludes trackball, data entry; and joystick, data entry. see also controller, data entry, automatic data processing.