Bluetooth V3.0 Optical Wireless Mouse Mice DPI 1600 for PC Notebook Laptop PC Black Switchable DPI among 800/1000/1200/1600. Powered by 2 AAA alkaline batteries. Work with Windows 98,ME,2000, XP and Vista OS. Frequency band 2.4-2.4835GHz unlicensed ESM band. Operating Distance: 10M.