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I bought it on aliexpress, don't have the reference anymore which seller it was, but if you search "RX Multi RF" you will find plenty. Attached is an picture of it. You basically hook it up to 9-30vdc, engage the 5th jumper, press a channel button for 3s and while the led is blinking, you press...

Hi, new here. I registered because I bought one of these (after reading this thread). It's working, I also got it hooked up to a "RX-Multi RF module". You need to set the 5th jumper=universal rolling code 433Mhz and then you can use channel 1 on the module for the doorbel button, and channel 2...