AaaaaahIt plugs into the usb slot but that in itself can be a pain. If you find yourself needing to use a normal usb charger you must first remove any case, then remove the back cover and then remove the charging coil and then reassemble it.
I might look into hooking into the other side of the usb socket when I get time, though I suspect it will probably involve disassembly and soldering something permanently in place.