Extreme Comfort - Slim, ergonomic design and Smooth Frosted surface offer an incredible user experience; 95% less noisy design with The Silent Micro Switch; smooth move with 1500 dpi Stable connection - 2.4 GHz wireless offers a powerful, reliable connection up to 15 m, no interference with other devices: The unique light-gathering technology interface improves the adaptability of the optical sensor Portable and durable - the USB receiver stays in your PC's USB port or, more conveniently, tucked away in the wireless mouse when not in use; with 300 million uses and up to 36 months in standby mode Plug & Play - Tiny wireless receiver slots in the USB port of the computer, more practical and hardly takes up space, in a few seconds it will be ready for the first use Universal Compatibility - works with Windows, Mac OS X, and Linux; perfect for work and entertainment in the home or office; Powered by 1 AA batteries (not included)