iMicro MO-IM309BK Laser Mouse with Battery (Black) Nano size, best for notebook users or kids Wireless freedom 2.4G FSK autolink technology 72 two way RF channels 6-10 meter operation range Laser tracking engine optional 800/1600 DPI precision optional 3 standard buttons and 1 dpi shift button for mouse 3 level power saving mode Nano usb shape receiver on mouse Auto power save model Compatible Windows 2000/ME/XP/Vista/Win7 Electrical Specifications: Sensor report rate on mouse:6500 times per second Operation angle:360 degrees