A4Tech Wired Optical Mouse WOP-35. Device interface: USB+PS/2, Movement detection technology: Optical, Movement resolution: 800 DPI. Mouse dimensions (WxDxH): 68.58 x 124.5 x 38.1 mm, Mouse weight: 226 g. Compatible operating systems: Windows98/ME/2000/XP(X64)/2003(X64)/MCE2005/Vista X86&X64 Mac OS 9.X - 10.X