... ):Self lock model: [For example 4ch wireless switch]Press remoter button A first time,the receiver relay is ON,press remoter button ... /OFF2):Non lock model:[For example 4ch wireless switch]Press remoter button A always,the receiver relay is ON,release button A ... 3):Commutative lock model:[For example 4ch wireless switch] Press remote button A,the receiver relay A is ON,the relay B ...