This is a replacement handheld Camper Jack Control Switch (MPD 85449). This is the wired control frequently found on Lance Truck Campers and used to control Atwood Leveling Jacks. This handheld used a 6 position phone cable to communicate with the relay module. It should not be confused with the wireless RF transmitter used on later models. We also offer the 6 position phone cable and the relay module in our Store