12VDC 315 MHz 4 Channel RF Receiver Module with Casing LM2596 DC DC Converter Module Resolution: 1g 1143306254 1000P Resolution: 1g Easy cascading of multiple modules The module runs on an external 12 volt supply as it's not inbuilt in the module To run the module just give the supply voltage and press the button on the receiver module once to get it on the pairing mode and now press the button on the transmitter remote and they will now get paired but only for that single button of the remote but if you have a transmitter remote with two button then you have to repeat the same process for the second button to get it paired again for the second button and same goes for the transmitter with 4 button