EagleTec M130 Wireless Bluetooth 3.0 4-Button Mouse with Adjustable DPI (1000, 1500, 2000) for MS Windows and Mac OS Long battery life and low battery LED indicator (powered by two AAA batteries) Avago A3000 optical sensor for high accuracy cursor control on almost any surface and power efficiency with automatic sleep function Quick-change DPI settings (1000, 1500, 2000) Reliable Wireless: Bluetooth 3.0 for lightning fast and clutter-free usage on most Bluetooth enabled devices EagleTec quality, one-year warranty, and customer service