>I just have a Motorola bloetooth headset for my phone and that
>has a mini-B connector for charging, they provided a 500mA PSU
>for that with the appropriate connector on it.
>So it's not that futuristic.

I have a Bluetooth GPS receiver like that as well. Came with a USB-A to 
USB-B lead and a car cigarette lighter plug with a USB-A socket, as well as 
a mains wall wart with USB-B plug on end of lead. IIRC the mains unit states 
it provides something like 5.1V 

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