Approx Optical Mouse. Device interface: USB, Movement detection technology: Optical, Movement resolution: 800 DPI. Packaging width: 120 mm, Packaging height: 190 mm. Packaging type: blister. Compatible operating systems: Windows XP/Vista /7, Packaging length: 35 mm, Mouse dimensions (WxDxH): 98 x 70 x 37 mm. Quantity outer carton: 20 pcs