OEM to iPod / iPhone Adaptors

We have a large range of OEM to iPod/iPhone interfaces allowing iPod to be connected to original head units with control of playlist and thre tracks, as though it were a CD Changer. At the same time the display and controls of the iPod/iPhone still work as normal as well as keeping the battery of the iPod/iPhone charged. These interfaces are designed to Plug & Play into the head unit.