Digital radio frequency technology (27MHz) and 256 ID codes offer you pin point accuracy without interference in range of 1.5 meters. Battery power saving mode with built-in battery charger and rechargeable battery Three programmable buttons support frequently used commands (at least 31 options,according to different systems), such as: F1 to F12, Alt, Ctrl, Shift, Cut, Copy, Paste, Undo, Enter, Exploring My Computing, Windows Help, Start System requirements:DOS5.0/WIN95/98/NT/ME/2000/XP Interface:PS2/USB/U+P Resolution:400/800 DPI Switch life:million times Cable Length(M) 0 Working current:35mA Working voltage:+3V+0.5V Sleep current:0.1mA Product size:120*65*38mm