The LittleFingers Keyboard - Track Ball, models LF-2500 and LF-2700, is a modified keyboard designed for use by children or individuals with limited finger dexterity and range of motion. This full-featured keyboard has reduced key cap size and spacing to allow persons with smaller hands to reach all of the keys without having to stretch. A built-in three-button trackball performs click, double click, and click and drag functions. The keyboard also has a built-in wrist rest and a wide space bar. A dual-mode feature enables a standard full-sized keyboard to be plugged in simultaneously. COMPATIBILITY: For use on Macintosh (LF-2500) or IBM and compatible (LF-2700) computers via USB port. DIMENSIONS (LxWxH): 12.5 x 7.25 x 1.25 inches. COLOR: Platinum gray. WARRANTY: Three years.