CableJive dockStubz Charge Converter and 30-pin Pass Through Adapter for iPhone, iPod, and iPad.

dockStubz is a small adapter for your audio dock or charge station so you can dock with your case on. Made for iPhone 4/4S and all other legacy 30-pin Dock iOS devices. The dockStubz Plus adapter includes charge conversion circuitry for older docks like the Bose SoundDock Series l, that do not charge while they are connected. Extra Power When connecting to passive 30-pin accessories, like the Composite AV cable or some automobile 30 pin dock adapters, the dockStubz+ also lets you inject power via a micro USB jack located on the side of the adapter. For a perfect experience, make sure to first connect dockStubz with the dock or speaker before you connect to the iPhone.

This is what you need to convert 12v car electrics to 5v to be able to charge your modern iPhone and play your music etc through the head unit. The video says it all.

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Looking for £28 posted.