Description The UNI-CHIME interface allows you to retain a vehicles original parking tones when upgrading to an aftermarket stereo. With an aftermarket audio system, certain features like parking tones, can become lost via the CAN system. But with the application of the UNI-CHIME this information can be re-interpreted and retained on select PSA, BMW Land Rover Please note: this product should be used when safety tones (reverse sensor audio, seat belt/car door open chimes) would not be retained when upgrading to an aftermarket stereo. This product needs to be used in addition to a separate ISO harness or steering wheel control interface - should you wish to retain those features.