Keep your MacBook Pro fully charged with the Apple 85W Magsafe power adapter. It includes a magnetic DC connector, which disconnects the power cable if it experiences strain to prevent fraying of cables. The Apple MacBook Pro power adapter also includes an LED to indicate charging status. It charges your system even when it"s off, on or in sleep mode. The DC cable can be wound around the adapter for easy storage. This Apple portable power adapter charges the lithium polymer battery of 15" or 17" MacBook Pros.