Genius Traveler 100 silver. Device interface: USB+PS/2, Movement detection technology: Optical, Movement resolution: 1200 DPI. Processor clock speed: 233 MHz. Mouse dimensions (WxDxH): 60 x 115 x 37 mm, Mouse weight: 110 g. Compatible operating systems: Windows 2000/XP/x64/2003/Vista, Mac OS X