Silent click product features: sensing technology: use optical tracking technology. wireless distance: 10m scroll wheel: battery capacity: 400mah tracking speed: 150 ips wireless system: usb 2.4ghz number of buttons: 6 (six) sensor resolution: 2400 dpi system requirements: windows xp / vista / 7/10 / mac silent click product specification: sensor technology: using optical tracking technology. wireless distance: 10m scroll wheel: have battery capacity: 400mah tracking speed: 150 ips wireless system: usb 2.4gh button qty.: 6(six) keys sensor resolution: 2400 dpi system requirements: windows xp/ vista/ 7/ 10/ mac.