Wired Optical Mouse is also available for this shape Ergonomic design, comfortable hand touch One hand controlling 5 keys for more efficient work 256 ID group to avoid interruption with other device Round direction non-block digital signal receive 27MHz RF technology free you up, no clutter, no hassle Advanced optical technology that glides on any non-reflective surfaces Highly precise and sensitive 800dpi resolution Automatic power on/off for extended battery life With USB charging cable, you can charge the batteries freely while working The transmission distance is up to 10 meters Dimensions: 128 x 68 x 43mm (mouse), 75 x 25 x 13mm (receiver) Weight: 115g (mouse and receiver) Button: 5-button design Switch life: 1,000,000 times Tracking resolution: 800cpi Max. speed (FPS): 6,400 frame rate Module type: optical Interface: USB port Battery MTBF: AAA battery Power consumption: 20mA max@5V Compatible OS: Windows 98/ME/NT/2000/XP This model can also be made into 27MHz RF wireless optical mouse