This is a coupler needed when installing aftermarket navigation systems, etc. in Honda vehicles. The shape of the radio wire coupler is square. It's surprisingly expensive to buy new. I am selling items that seem to be usable without any problems even if they are used, so I think you can use them with confidence. If you want multiple items, please feel free to contact me. Navigation Audio Coupler *Used item* If an electro tap was originally attached, it has been removed before listing. Therefore, there may be exposed wiring where the vinyl has been stripped. We recommend repairing it with vinyl tape or the like before use. *Since it will be shipped by regular mail, there is no tracking number and it will take some time for the product to arrive.* (Delivery is only available on weekdays)