The combination of genuine navigation and after-mount digital tuner allows you to change the terrestrial digital channel with the steering switch. The steering switch allows you to control the channel of the terrestrial digital tuner. The convenient steering switch cannot be operated by the terrestrial digital tuner that was installed on original navigation systems. Once installed, the steering switch will allow you to control the channel of the terrestrial digiter. The terrestrial digital tuner must be equipped with an infrared remote control. Only the domestic manufacturer model digital tuner has been confirmed. Even when you are watching terrestrial digital, you can use the steering switch to operate the channel without realizing the genuine feel. Determine the remote control signal in detail. Eliminates waste data common with learning remotes, and faithfully reproduces the remote control signal. Furthermore, thanks to the rapid ALCON signal processing engine, the response is enhanced when you press the steering switch, and it has a quick and comfortable operation experience that is the same as the original audio operation. Please check the manufacturers website for compatible vehicles and models.