... design,for both hands 4,OEM & ODM NEW COLORFUL CAR AUTO SHAPE HIGH-PRECISION USB OPTICAL MOUSECompatible With: Windows 2000, Me ... .Specifications:RF carrier: 2402-2480MHzRF operation channel: 16, auto frequency hoppingUSB: USB 2.0Operation systems: Windows 2000, Me, XP, Vista, Win 7 ... returned must contain all original packaging materials. NEW COLORFUL CAR AUTO SHAPE HIGH-PRECISION USB OPTICAL MOUSE