Comfort - designed by ergonomic experts for comfort in either hand, with rubber grips featured on each side of the mouse. Snap-in Receiver - use this to turn off the mouse and extend the 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 - red light shows when your battery is running low. Magnifier - point and click to enlarge and edit details using. High Definition Optical Technology - more precise, more responsive and deliver smooth tracking. Designed for notebooks PCs, compact and comfortable. 6+ months battery life.