Bluetooth Wireless Mouse - All Bluetooth Integrated Nbs with xp, SP2 Pre-installe Using Bluetooth technology and stylish compact design, this mouse provides the ultimate in wireless freedom New low friction, non-stick PTFE sole reduces strain on hand For use with Microsoft Windows XP Professional or XP Home Edition Battery life - Approximately 3 months using 2 AA batteries Unit Dimensions - Approximately Width 2.2 x Height 1.3 x Depth 5 inch