1-Channel Infrared Remote Control Relay Module Learning IR Switch 5V Learning IR remote control switch, as the name suggests, the microcontroller can remember a button on the remote control key data It can control relays switches, through learning again, you can modify key data storage. For example, you use the remote control for this "8" learning key, you can use after the success of "8" to do the control buttons, power-down data is not lost, if you want to use the key "9" as the control, then you need to re-learn the microcontroller to make changes.