... functions together.One is self lock model,anotheris no lock model,the third is commutative lock ... : [For example 4ch wireless switch]Press remoter button A first time,the receiver relay is ON ... function:When Jumper is OFFpossition, when press button A on the transmitter, receiver channel A goes ... wireless switch]Press remoter button A always,the receiver relay is ON,release button A,the receiver relayis ...