829LM Liftmaster Garage Door and Gate Monitor
For use with Liftmaster, Chamberlain, Craftsman and some Raynor garage door openers with MyQ technology (see compatibility lists below). Compatible openers will have the MyQ logo printed on the side of the opener and a Yellow Learn Button.
you won't have to go downstairs or outside to see if you accidentally
left the garage door or gate open. With the LiftMaster® Garage and Gate
Monitor, you can check and close the garage door or gate from any room
in the house.
MyQ® enabled technology allows you to monitor and close up to four garage doors or gates from any room in the house