A4Tech Gaming Mouse Multi-Speed Silver. Device interface: USB+PS/2, Movement detection technology: Optical, Movement resolution: 1000 DPI. Mouse dimensions (WxDxH): 58 x 114 x 41 mm, Mouse weight: 118 g. Compatible operating systems: Windows 98/ ME/ 2000/ XP(X64)/ 2003(X64)/ MCE2005/ Vista X86&X64