I had this system professionally installed. The bell does ring when I back up and when my turn signal goes off and the sensor picks up traffic. One area that is not working properly is when I apply the brake and when autobrake is engaged, the sensors pick up traffic and ring the bell as cars...
It does work, but I cannot figure out how to save favorite channels. Only option I have is to turn the dial to what I want to listen to which can be a pain.