Mouse Wireless Optical Number of Buttons 3 Black Connector Type Nano Receiver Compatible With Mac(R) OS X 10.3.9 and Later Windows(R) XP Vista(TM) 7 Battery Size AA Number of Batteries 1 Height 8 1/4 in Length 5 29/32 in Width 3 1/2 in Features 30 ft Wireless Range Includes Battery