RP301P2, 2 separate channel, 30A relay, on/off dry contact 0v output, with LONG RANGE remote control plus one back up remote control this set is for use to make open and close contact on your project up to two devices with a same remote transmitter Popular uses in auto, motorcycle, RV, boat, pc mod, hobbyist's project and more... require 12vdc with minimum of 500mA power source, require an AC to DC adapter if use with AC outlet remote transmitting range ~500ft *range vary depend on interference in the area, device setups and battery strength relay max. load 30A battery included with remote transmitter.