... * 69 * 20MMUSER MANUAL KL-K400C 4 Channel Remote Control Switch With Remote Control 1. ProgrammingPress learning key for 3s, the indicator ... the receiver relay is off, the same as B/C/D.Extend function:(When jumper is off position ... is on, the relay B/C/D is off.Press remote button B, the receiver relay B is on, the ... relay C is on, the relay A/B/D is offPress remote button D, the receiver relay D is ...