The MX Master wireless mouse comes with a rechargeable, non-replaceable battery that can last up to 40 days on a single full charge. It takes about two hours and 45 minutes to fully charge your mouse. You can use your mouse while it's charging.

NOTE: The provided Micro USB cable is used for charging only. Your mouse must be connected using either Bluetooth or the Unifying receiver in order to use it while it's charging.

There are three LEDs on the side of the mouse that indicate the battery status. When the LED turns red, you should charge your mouse. See MX Master mouse battery status indicators for more information.

To charge the mouse:

1. Insert the provided USB Micro cable into the micro USB port on the front of your MX Master mouse.
    

   

2. Plug the larger USB plug into your computer.

The three green battery status LEDs turn solid green when the charge is complete.