Review on Wireless 433MHz RF Module Receiver With 4 Channel Output – QIACHIP RX480E (20 Pcs) by Martin Dosunmu

I'm using these to monitor up to 16 remote sensors with one microcontroller. So far I am very pleased. All the units I have used so far have worked, which isn't necessarily the case with all overseas suppliers. I'm using within a house (60 ft distance through walls) and haven't had any issues with signal, but I haven't tested the 50m range. Very easy to pair. As noted, the pin numbering 1-4 doesn't match between TX and RX, so you will have to test. Nice working voltage range for battery powered designs. You can't beat the price for this pair, I'm hoping the long term (> 1yr) durability will be there also.