QIACHIP 433MHz Wireless Remote Control Switch Mini Receiver Built-in Learning Code 1527 Decoding 4 Channel Output with 656 FT Long-Distance Remote Control 4-Button Transmitter White

Update: The module is working now and I am happy with the product. The problem I had was in the instructions. It does not tell you that you have to set the "Working Mode" before you pair the modules. Also the instruction video from Qiachip clearly shows that you can change the working mode after you pair the modules. I wanted the receiver to latch it's output "on" and turn the channel off with the same button. That is selection 2 in the working mode.I really wanted to like this transceiver. Very simple to use with good range and small. However, the "Multiple Working Mode" will not shift between the "3" options. It is stuck in "Momentary Mode" and this will not work for my application so it is useless to me. I sent a support issue to Qiachip but they did not reply so don't count on "Product Support" from Qiachip, very disappointed!!!

This is the way to get digital programmable remote with extended range for 9 bucks. Remote will work with lots of stuff like SONOFF R3 switch. You can also get 2 for 15 bucks from another seller. I did not need 2 that's why this is good deal for me.

5v output is enough, which is better connect with another relay to drive higher output, TX/RX are good 5 function for the small remote controller.

The unit worked perfectly as advertised. I was pleasantly surprised by the remote. It came with the 12vdc battery and was easy to hold and use. The price is right too. I used the unit to drive a voice module. I used a 2N2222 transistor to convert the high output to low which is necessary to control the voice module. Worked great. The best part is NO relays.I gladly give this a five star.

I am having terrific fun with these units. So far so good. Testing out all good and rugged enough. Solid performance helped me to figure out troubles with other transmitters. I made a transmitter tester that makes me smile. WHAT? ... I needed buttons, and it works great. I found limits of the range acceptable for most applications without the need for the antenna. I did notice the range increase with the antenna. The antenna was required to clone (scetchy) key fob remote. (from a different seller). I believe it took the strength of this unit to get those key fobs working. Rated current is 10-20ma? Seems on par. No actual measurements. It is a healthy usable signal

Pins D0-3 didn’t work at all. Luckily the RT did. I guess it’s just hit or miss on the quality and I got unlucky. And yes I paired the remote and put in the proper mode.

Didn't know what to expect I have a lot of RF background and was amazed at the specs Receiver sensitivity and RF output. I did a RF propagation calculation to see if it would meet my needs and it did. The big thing was would it meet the specs they gave me. Well I am pleased to say it did. I need a device that I could send some switch closures to the remote receiver. I have a large building a distance from my house over 150 feet and I wanted to get an alarm if my smoke detector went off. I had to make a modification to the detector to interface to the transmitter but it works great. Did not have to trench to run wires and the cost for these devices are Great. I had no problem pairing the devices and plan on doing the same thing in another building. I bought the ten pack so I would have additional ones for future projects. I love that if I am not happy with my order I can return them and get my money back. I love Amazon what a GREAT company. Hope this was helpful and encourages you to give it a try.

The modules I'm reviewing right now are very good, but most of the cheap 433 MHz transmitter/ receiver pairs you see advertised aren't a good deal, because they require a digital encoder chip on the transmitter side and a digital decoder chip on the receiver side. Or, you need a microcontroller on both ends to make them work. Either way, you can't use them unless you build a circuit board to hold the extra components. The sellers never bother to tell you that additional components are needed to make those modules work. One pair that I purchased and tested (not the pair I'm reviewing here) has a big round metal can on the transmitter board. It was only when I tried to use those units that I discovered they were not stand-alone modules. I didn't want to bother ordering the encoder and decoder chips and then spend time building circuit boards for the modules, so I never used them. Those units were so cheap that they weren't worth the cost of shipping them back, so they ended up in my junk box. A product you don't use is not a bargain at any price.Just to be clear, the QIACHIP transmitter and receiver modules I'm reviewing here do not need any extra components to work and should not to be confused with the units I just described. I wanted to point out how these modules are superior to the modules that require support chips to work. These QIACHIP modules are about the same price as the other 433 MHz units, but you get a completely self-contained, four channel transmitter/ receiver pair with these modules that can be used independently, without the need for either a microcontroller, or encoder/decoder chips. However, if you want to add remote control to a microcontroller project, then the pins on this receiver can be plugged directly into a Arduino UNO without the need for any other interface components. I use digital pins 8 through 13 plus GND on the UNO. Just remember to set digital pin 13 high in your code to supply 5 Volts to the receiver. These units also have very good range. The little coil antennas are included, but you have to solder them to the boards. However, you many not need the antennas. I haven't tested the maximum range with the antennas attached, but these little units reach all over my house without the antennas. The instructions are confusing at first, because the receiver has three different operating modes, but the modules are easy to pair and program after you figure out how.Now, for that "one little catch". The only complaint I have about these modules is there is no logical correlation between the numbering of the channel selection pins on the transmitter and the labels of the digital output channels on the receiver. I was only able to figure it out by trial and error. The transmitter module's channel selection pins are numbered 1 to 4 and the receiver's four digital channel output pins are labeled D0 through D3. You'd think transmitter pin 4 would correspond to receiver output pin D3, because the receiver channels start at D0 and the transmitter channel pins start at 1. But, in addition to the offset, the numbering systems on the modules are also reversed. In other words, D0 on the transmitter does not correspond to pin 1 on the transmitter. Just when you think you have it figured out, you discover that receiver pins D0 and D1 are reversed within the bigger reversal. It's such a mess that if you're using these units in a stand-alone configuration, then you'll need to make up a table to keep the channel relationships between transmitter and receiver straight. And, if you're using these units with a microcontroller, then you'll have to sort it out in your code and hope the next pair you buy doesn't have the channel's scrambled around in a different way that will force you to modify your software. At first, I assumed the problem was unique to the first transmitter/receiver set I purchased, but I purchased a second set later and it had the channels scrambled in exactly the same way. If it wasn't for the illogical channel number relationships between the transmitter and receiver modules then, these modules would get five stars from me, because other than this they are a terrific bargain for the price.