Wireless receiver 1.Memory function 2.AC220V 3.4ch with case ... a 4CH RF Wireless Remote Control Switch, it is widely used in electrical operated gate and window, motor, blind, light/ ... will flash slowly, press the “Learn” button on the receiver board when the led is off, keep pressing until ... the led is on, then release, indicating the receiver is ready and waiting to learn from transmitter. c) ...