Features: 1) RF wireless Optical technology 2) 256 ID codes for each channel, avoiding interface problems 3) Mini size 4) Receiver work range: 1.5 - 2m 5) Battery saving 6) Longer battery life mode 7) Wheel working software 8) Easy scrolling under Windows 95/98/Me/NT/2000/XP 9) Resolution: 800dpi 10) 6 button