2.4GHz Optical Wireless Cordless Mouse Mice USB Receiver Laptop Computer PC Power supply:1*AA battery(not included) Rated working voltage: 1.5V; Rated working current: 13mA Resolution: 1000CPI-1600CPI Adjustable Size:107 x 76 x 25mm Compatible with Windows XP, Vista, Windows 7, ME,2000 and Mac OS...or latest