... for home alarm system, garage door control unit. It is 3 channel relay output receiver control unit, with learning function.Suit for ... :1,Learn rolling code 2,Operating voltage range: DC12-24V 3,Can learn up to 2 transmitters 4,Positive and negative ... trigger5,3 channels relay output 6,Frequency: 315MHz, 433.92MHz7,Modulation Mode ...