Review on 🔒 LiftMaster 882LM Security+ 2.0 Multi-Function Control Panel: Efficient Home Security Enhancement by Brian Cooper

I have a LiftMaster garage door opener. From all available material this should work, but it doesn't. I read the installation guide and checked all the answers to the questions in the reviews. I installed according to the instructions, the yellow light is flashing. Not pressing the button as instructed will change it. The door doesn't open for me, the light doesn't come on. That does not work. I removed and reinstalled the simple doorbell button that was there before and the door works fine. I would like to add that it almost looked like the product had been opened when I received it. The device was not in any packaging in the box, there was only a screw and an installation sheet. I hope I can bring this back to find something that works. It was a waste of money and the time it took to get them.