RF wireless trigger, 4 channel, key fob trigger. This is a 4 channel wireless relay box. There are 4 seperate relays that can each handle up to 5amps at a max voltage of 30vdc or 300vac (so it will work fine for haunt applications are typically up to 24vdc or 110vac). A 4 channel key fob trigger is included, when a button is pressed, the relay will activate for as long as you hold the button down, in a momentary fashion. This works great for an actor to trigger multiple controllers or effects in a scene from one remote.