EagleTec M122 2.4GHz Wireless Optical 3-Button Mouse With Adjustable DPI (800, 1200, 1600), And Nano Receiver (Green) Energy efficient with automatic sleep function for long battery life LED optical sensor for high accuracy cursor control on almost any surface Adjustable DPI settings (800, 1200, 1600) Reliable Wireless: 2.4GHz for lightning fast and clutter-free usage on PCs EagleTec quality, one-year warranty, and customer service