It uses a flat, wide type plug that I have not seen elsewhere. See photos of the plug.
Sony Ericsson HCA-200 Advanced Car Handsfree Kit - New Old Stock - Boxed
Motorola HFW8000 Bluetooth Wireless Car Kit Handsfree New Old Stock
Supertooth Light Handsfree Kit Bluetooth Mobile Hands Free Car Kit BTSLPHO Black
Bluetooth 4.2 Car Handsfree Kit with Built-in Micro Speaker Clip
