Motorhome brakes were not designed to stop the added weight of a towed vehicle. RV'ers towing a vehicle need BrakeBuddy, the best selling auxiliary braking system that shortens the overall stopping distance and keeps them legal with all North American towing laws. The classic alert system gives you peace of mind that your BrakeBuddy is doing its job. Simply plug the transmitter into your BrakeBuddy and plug the receiver into the lighter receptacle. A red light will illuminate letting you know that your BrakeBuddy is activated. The driver will be alerted if the towed vehicle becomes detached.