Tekonsha 90250 Prodigy RF Electronic Brake Control The perfect multiple vehicle-shared trailer solution, suitable for any trailer with up to 3 axles Hand Held control unit in the Tow Vehicle, Trailer Power Module on the Trailer Wireless communication between the remote hand unit and trailer mounted power module Proportional braking, forward and reverse, no level adjustment necessary.Trailer braking power supplied via 7-Way Connector from the vehicle Compatible with tow vehicles that have multiplex wiring systems