Specially designed to keep the natural “handshake” wrist and arm posture for long-term health benefits. contoured shape seamlessly fits and moves with your palm, allowing smoother movement and preventing hand fatigue.Equipped with 6 buttons for working or gaming. 800/1200/1600 DPI resolution optical tracking technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces.the up/down buttons simplify web browsing for easier working or studying.Powered by built-in rechargeable lithium battery instead of disposable batteries, you can charge the battery via the USB charging cable (Included) when the battery level of the mouse is depleted.Enters power saving mode after 8 minutes idle, press right or left button for it to wake.