This Orbit rain sensor helps promote water conservation by detecting freezing temperatures and rain fall. This hardwired freeze sensor is designed to work with 24-volt automatic sprinkler systems and is durably constructed for many years of dependable water conservation. This sprinkler system rain sensor comes with 30 feet of connection wire for easy installation to a sprinkler system. With hydroscopic discs, this sprinkler rain sensor absorbs water to relay information for shutting off an automatic sprinkler system when it rains or there are freezing temperatures. This rain freeze sensor is ideal for all sprinkler system use as ways of water conservation. Features and Benefits: Hydroscopic discs absorb water, Works with 24-volt sprinkler systems, Comes with 30 feet of connection wire.