Wireless mouse features a compact design, plug-and-forget nano receiver and intelligent battery management. Advanced 2.4 GHz wireless connectivity delivers fast data transmission and virtually no delays or dropouts. An indicator light alerts you when the battery is low, and automatic sleep mode turns off the mouse when you're not using it to conserve your battery. Wireless mouse includes a nano receiver, one AA battery and USB compatibility. Mouse is also compatible with Windows XP, Windows Vista, Windows 7, Mac OS X 10.4 or later, and Linux kernel 2.6 or later.