Features:. Optical Sensing Technology. 2.4 GHz Wireless Connectivity. Automatic Wireless Synchronization. Scalable DPI. Built-in Scroll Wheel. Storable Nano Receiver. System Requirements:. PC & Mac Compatibles. Windows XP, Vista and 7.Package Contents:. 2.4 GHz Wireless Optical Nano Mouse. Nano Receiver. 2 AAA Batteries. User"s Manual. Warranty Information