PRODUCT DESCRIPTION : Microsoft Explorer Mouse TECHNOLOGY : BlueTrack Technology WIRELESS FREQUENCY : 2.4 GHz frequency range INTERFACE : USB 2.0 RANGE : 30 feet (9.14 meters) BUTTON : 5 buttons including scroll wheel button * Microsoft BlueTrack Technology combines the power of optical with the precision of laser for remarkable tracking on more surfaces * Allows your mouse to work on more surfacesincluding granite, carpet, and rough-grain wood * Snap-in Mini Transceiver for Portability * Easy Recharging, the battery status indicator tells you when a quick recharge is needed. The compact, stable recharging base is easy to use * Sophisticated Design and Ergonomic Comfort - glowing blue light effects and comfortable curved surfaces * Control computer from wherever you are with long-range wireless freedom * 3 Weeks Between Charges * Scroll four ways for greater efficiency and comfort with Tilt Wheel Technology * Customizable Buttons * Point and click in comfortergonomic design helps you work longer without discomfort