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Demco's Coach Link plugs into your coach's power port and wirelessly receives a signal from your Demco supplemental braking system (SBS) in the towed vehicle. It gives you an audible tone and instant visual feedback confirming the brakes are engaging as expected, so you're not left wondering whether your towed vehicle's brakes are working.
A useful peace-of-mind add-on for RVers running a Demco supplemental braking system on their towed vehicle.