Black wireless mouse with built-in rechargeable battery Stable connection and energy efficiency The 2.4 GHz wireless mouse provides a powerful and reliable connection, effective up to 10 meters. This mouse turns off automatically after 8 minutes of inactivity for energy saving, it can be reactivated by clicking any button. Silent and durable click The silent design for the left buttons and right makes you work or play in a quiet environment, it will not disturb others. 3 DPI of adjustable level You are free to adjust the sensitivity of the mouse according to your preference with 3 DPI levels available (800-1200-1600). Ergonomic design Slim, ergonomic design and smooth frosted surface for an incredible user experience. And the symmetrical design allows it to fit in both hands. Perfect for work and entertainment at home or in the office Plug & amp; Play Just plug in the USB receiver, which is located at the bottom of the mouse, for easy use.  No driver required How to use 1. Charge the mouse for about 2 hours before using it for the first time. 2. Take out the dongle, which is located under the back of the mouse.  3. Insert the dongle into the USB port of your PC.  4. Turn on the mouse, the switch is located at the bottom of the mouse.  5. Wait a few seconds for it to initialize, no user action is required. Note: Use the computer's USB interface to charge the wireless mouse. The charging current of the mobile phone charger or other charger is large, which may damage the battery or shorten its life.