These Remote Detection Unit send a 12 or 24 volt positive (+) output signal to an alarm/warning device (not included) when an input signal from either a water probe (not included) or a vacuum switch (not included) is received.
This is a low amperage device, and must be used with a relay to power a horn or indicator lamp if their current draw is over 1 Amp.
Plastic enclosure measures: 3" x 2.5" x 0.75"