... , then goes off automatically, same of B/C/D.2) Non lock modelPress remote button A, the receiver relay is on, release ... same as B/C/D.3) Interlock modelPress remote button A, the receiver relay A is on, the relay B/C/D is off ... on, the relay A/C/D is off.Press remote button C, the receiver relay C is on, the relay A/B/D is offPress ...