Installing the Bluetooth Adapter and Microphone
The StreetDeck bluetooth adapter can be plugged into the included USB extention cable for the G4. The adapter should be hidden someplace in the car where it will have no metal between it and your phone.
The microphone included with the StreetDeck bluetooth kit should be plugged into the back of the G4 in the port labeled "Mic". I simply placed the microphone in between a couple panels in my car and compressed the cable in between them to hold it in place. The closer the microphone is to the user, the better it will work. In StreetDeck, both the "Boost Speaker" and "Boost Microphone" in the bluetooth volume options module should be checked when using this microphone on the G4 as well as unchecking the bluetooth option to keep the mic on when speaker audio is present (Half Duplex Mode).