Looking to pick this up as a potential spare for my 730 to mod in the car. It's cheap right now on the TomTom site for $13. However, an curious if anyone can tell me if the power plug is hard connected. From the picture, it looks like it may be a USB cable that plugs into the bottom of the AC unit. Can anyone confirm? I would really like another USB dock but they don't seem to offer one on their site. Anyone can provide answer of pictures be much appreciated.