
Easy to install - This unit is designed to work with an existing 4 wire intercom installation. It does not include the rough-in kit (the box inside the wall).I bought this to replace an ancient, broken, M&S door intercom.It arrived without instructions but installation was a breeze. There are four connections to make, two for the speaker and two for the lighted button. You have to remove a small cover on the back of the button when connecting the wires.The faceplace screw positions are identical to my old (15+ years) faceplate. The whole operation took less than five minutes.
DONT BUY!!! - BAD PRODUCT, NOT COMPLETE... DONT BUY!!!