As this thread is just over a year old I thought I would add my comments as I’ve just fitted a smart WiFi garage door opener to our old Chamberlain system. I fitted this new add on today. The old up and over garage door, Chamberlain operated remote failed a couple of years back and as we are on lockdown I ordered a Meross smart garage door opener. Very simple to fit and it leaves the inside push button in operation. The Chamberlain 500ML unit was installed back in 1998 ish, so I was not so surprised when the remote failed and parts were no longer available, but I did miss not having it. I did a bit of online research and the Meross unit read well. Comes with good installation instructions and cables. All I needed to add was 3m of plastic conduit so I could feed the Open/ Shut cable for the units read-switch thats necessary for the doors notification you get when operating., this I ran along the top of the chain rail with plenty to spare. So for about £30 we are back having the garage door fully operational with a smart WiFi app .