Wireless Trailer Light Monitor Kit. Monitor your trailer lights while driving, NO wiring required! SAVE!
Installs in just minutes to give you an in-cab status report of your trailer lights, power and connection. For use with incandescent lighting systems with 4-way flat wiring connection. Fully submersible. Simply rout your trailer's wiring through the transmitter unit, and plug the in-dash receiver unit into your truck's 12V outlet.