Tekonsha 90885 Prodigy P2 RV Trailer Brake ControllerReverse battery protection for both vehicle and breakaway systems; Designed to work with electric over hydraulic trailer brakes; Multiple mounting options including 360 degree vertical rotation; No level adjustment necessary it adjusts itself to varying terrain as you drive; Great for backing into tough spots! Works proportionally in reverse with the ability to disable when not needed; Produces stops that are in proportion to vehicle's deceleration