HiLetgo 5pcs 433MHz RF Wireless Transmitter and Receiver Module Link Kit for Arduino/Arm/McU/Raspberry pi/Wireless DIY

They don't include an antenna, but it's easy enough to make your own out of a17.3mm long piece of wire. The first pair I tried worked very well as soon as the antenna was soldered on. I haven't done a range test yet, but they've gone through several walls in my house. I ran an all night test repeatedly sending transmissions and it was still working when I woke up. Hiletgo seems to be one of the better sellers of this type of stuff.

it was ok

It seems like these things have a high failure rate from the many different reviews with duds. I managed to Receive and Send with the first pair I picked out of the bag. Did not try the other 4 pairs. No noise from either module, range utilized for receive was about a foot and the range tested for send was 12 feet. Since this is already in working condition, I will not test further ranges.

These RF Tx/Rx are complete junk. Even with the proper length of wire for the attenae it was way less than the advertise distance/performance. Max distance was about 5' from each other. Not sure how the other review stated they got over 200' of distance where the majority of reviews got way less. The chips were soldered so poorly that the resin and solder splashe were everywhere and pins were sticking out by 3-4mm on the backside. Seller was quick to response, but did nto provide any other usefull info other than diagrams of the pin-outs.

I gave a star for each unit that worked (3/6)!