Have the unit for only a few days, but I'm super happy with it. It served its purpose, my HTC Desire HD fits into the station, and the thing looks really good! The battery is charged through the supplied power adapter, or via the USB port of the computer. Synchronization only works with a connection to a computer. One of the USB ports on the rear panel is used to load the phone and synchronize the 2nd port is only for charging the 2nd battery (if present). Overall, highly recommended. Five Stars. Would like to have such a station, but unfortunately the device is currently not available. Too bad.