... models 4.good quality and high accuracy 5.shenzhen factory Net Bar MouseSpecification:Optical mouseUSB, PS2, U+P Port optional.800 ... ,000pcs/month Resolution:800/1200DPISupport system:Windows 98/ 2000/ XP/ SE/ NT/ Vista/ Windows 7 etc latest systemsPacking:1pc/color box ... /T, balance 70% be paid before shipment or after inspection. Net Bar Mouse