1012323 - REMOTE CONTROL 4CH RELAY SWITCH 12V 433MHZ WITH TRANSMITTERIt is a learning code wireless remote control switch (receiver) the output way working way can be changed as you like it is easy to match the transmitter. It has 4 Relays which can make the equipment turn or reverse on off and so on come true. The volume is small and the performance is stable and reliable high receive sensitivity. 1. It covers application ranging from simple domestic remote control to autonomous control like auto door window lifting