The desktop charger complements the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G models, providing a full-duplex speakerphone for hands-free communication and desktop charging. It provides connectivity to the phones through a Bluetooth interface, with audio control provided by the keys on the phone while it is located in the dock. In addition to charging the phone while in the dock, the desktop dock also charges a spare battery if fitted into the battery slot on the rear. This docking station contains an extra feature, “Booth mode”, whereby a fully charged battery inserted in the rear battery slot can be used to operate the desktop charger and speakerphone when disconnected from wall power. This feature provides a quick and simple form of conference when moving to a small private room. The desktop charger uses a different power supply from the phone. Please note that the phone power supply is not required when using the desktop charger.