Review on SadoTech Wireless Doorbell for Home - Long Range Wireless Door Bell with LED Flash, 2 Push Buttons + 1 Receiver, Battery Operated, Matte Black by Richard Gallagher

My old doorbell was a GE model. And I had two different versions of it. One ran off three D-cell batteries. The other plugged into the wall. Both used the same wireless push button. The bell had two different "tunes" that you could choose. And the bell and push button had sixteen possible codes that they could be set to if there were more than apartment in a complex with the same doorbell. You set the code by moving jumpers on twp sets of pins. Well, the wireless part mounted outside , the literal "push button", died. I suspect that corrosion was involved. I noticed a while back that the button would work when pushed in certain ways, not work if pushed differently. Eventually the thing died altogether.My first thought was that I would buy a replacement button. I used to see them on Walmart. But when I went looking I couldn't find anything that looked like the old push button. I finally decided to replace the whole thing, bell unit and wireless push button. This bell has a boat load of different tunes you can choose (but I wound up accepting the default, an unpretty but effective two-tone bell sound that does a good job of piercing through my music and the sound of the TV). Also it came with two push buttons. I just set the second push button aside. If the first one dies, I have a spare.I'm not sure how the bell unit knows which push buttons to respond to. The rudimentary docs say you can get additional push buttons and "train" them to respond to your bell. No jumpers to move. It's all done in software like pairing blue tooth devices. I assume that this means that the bell unit has a code embedded somewhere inside, something like the MAC codes in conventional networked hardware, and the push buttons "learn" this code. I haven't had the bell long so I can't say if it will hold up in Florida's humidity over time, but for the last few months the bell has worked well.