LEXMA M715R Black 3 Buttons 1 x Wheel USB RF Wireless BlueTrace Mouse Power Supply: 1 x AAA Battery Distance: 33 ft. Operating System Supported: Windows 98SE/2000/NT/ME/XP/Vista/7 and higher Mac OS 10.4.X and higher System Requirement: USB port Package Contents: Wireless BlueTrace Mouse User's Manual 1 x AAA Battery Micro Receiver