Microsoft Wireless Mobile Mouse 3000 - Black Comfort - Designed by ergonomic experts for comfort in either hand. Snap-in Receiver - Use the snap-in receiver to turn off the mouse and extend battery life. 4 Buttons - Use the Back button to easily navigate folders or Web pages, and press the scroll wheel for AutoScroll. Battery Status Indicator - Light indicates when your battery is running low. High Definition Optical Technology - More responsive, more precise, smoother tracking.