Adesso iMouse G25 - Wireless Ergonomic RF Laser Mouse Interface: 2.4 GHz Radio Frequency Wireless Technology Features: Ergonomic Design, DPI Switch, Auto Sleep Mode, Power Switch & (2) Internet Navigation Buttons Power: (2) AAA Batteries, included Internet Hotkeys: Back and Forward Tracking Method: Laser Sensor Range: Up to 30ft Adjustable DPI: 3 Levels (800, 1200, 1600) Indicator: Low Battery