The Complete Remote Set allows pay machines to offer a free vend option. Included in the set are the Remote Receiver and the Remote Transmitter. The Remote Receiver is located inside of the air machine and is used to receive the signal from the transmitter located inside the building. The Remote Transmitter is a push activated button that transmits the signal to the Remote Receiver to activate the machine. Compatible with SC05 (Pre-2020), SC09-SS & SC12-SS.