Specifications Connector: PS/2 or USB Hardware resolution: 520 DPI-super Power supply: 5V Cable Length: 1.5m Size: 112(L)x52(W)x29(H)mm Working temperature: -45~50 Working humidity: 20%~90%RH Compatible with Windows95/98/NT/ME/2000/XP Advantages 1. Reliable optic-mechanical technology. 2. Universal scrolling function. 3. Ergonomic design comforts your hand 100%, Reliable quality and. no driver needed, just plug & play.