Microphone for use with handsfree kits and after market head units with a 3.5mm jack mic connector

Special relay to mute audio when reversing to allow parking tones to be heard clearly.

This relay is designed for aftermarket radio fittings where a parking sensor retention interface has been fitted.
This relay will use a positive reverse gear signal to mute the new head unit, so when the car is reversing the radio is silent and the parking tone interface can be heard clearly.