The keyboard and mouse adopt advanced Bluetooth chip technology to provide stable and powerful cordless connection, it’s easy to connect and easy to use. The working range up to 10m. This keyboard features volume control, previous, next, and other me<br />The keyboard and mouse both have built-in rechargeable lithium battery, continuous working time up to 80 hours after fully charged, no need to replace the batteries. They will go to automatic sleep mode in about 15 minutes if not use and you can pres ">