... self lock model,anotheris non lock model,the third is commutative lock model.Explanation:1):Self lock model:[For example 4ch wireless switch]Press ... open/close,light ON/OFF2):Non lock model:[For example 4ch wireless switch]Press remoter button A always,the receiver ... and negative wireless control 3):Commutative lock model:[For example 4ch wireless switch]Press remote button A,the receiver relay ...