The Acclima 1 Zone Decoder is used to connect 24 volt AC solenoid valves and relays to the Acclima 2-wire system. It is designed to be installed in valve boxes or underground wiring boxes where it can adapt any 24 volt AC solenoid valve or pump-start relay to the 2-wire system, thus providing communications to and control over those devices from Acclima's CS3500 controller.