4 channels receiver transmitter

video 

https://www.youtube.com/watch?v=ooaRY09cWLM&t=10s

https://www.youtube.com/watch?v=nGT-MK_DjAE

https://www.youtube.com/watch?v=Q6svmNgOeCU

https://www.youtube.com/watch?v=oWh4PW6qrxg

This 4-channel radio transmitter & receiver works with  3 adjustable control modes. The radio set can be used for remote control of 4 electrical appliances. With features of anti-interference, counter current protection, excessive current, it is applied to almost all electrical system, such as lights, motors, door opener, garage door, electric lock, roller shutter, anchor winch, crane,
These products are also relay output, which means that you control the AC or DC devices. There are the differences in connection of light, motors, pumps, etc.