Optical Sensing Technology. 2.4 GHz Wireless Connectivity. Automatic Wireless Synchronization. Scalable DPI. Built-in Scroll Wheel. Storable Nano Receiver. PC & Mac Compatibles. Windows XP, Vista and 7. Mac OS 10.3 and above. An Available USB Port. 2.4 GHz Wireless Optical Nano Mouse. Nano Receiver. 2 AAA Batteries. User"s Manual. Warranty Information