Comfort for Either Hand - Modern design and premium finish provides comfort for either hand. Symmetrical shape and unique rubber grips give you control and cushioning Snap in and Go - Simply snap in the transceiver for convenient on-the-go storage Reliable Wireless - Microsoft 2.4 ghz wireless delivers a reliable connection with up to a 30-foot range 8-Month Battery Life - Use your mouse without power interruption for up to 8 months. The snap-in transceiver automatically turns the mouse on and off, and the led battery status indicator lets you know when replacement is needed