... again ,the receiver relay is off, the same as B/C/D.Extend function:(When jumper is off position) ... goes on 2seconds,then goes off automatically.same of B/C/D.2) non lock modelPress remote button A ... A, the receiver relay is off, the same as B/C/D.3) interlock modelPress remote button A, the ... D is on, the relay A/B/C is off.II. Specification1) input voltageAC:220v,DC:12v2) optional frequency315MHz OR ...