Firefly 390 81LM Liftmaster keychain compatible with better range & you pay less!
Liftmaster 81LM REPLACEMENT REMOTE compatible with LiftMaster and Chamberlain 390Mhz billion code systems. GREEN LED LEARN LIGHT ONLY on the back of the motor. Charcoal One button Programmable Key chain version 390 MHz A23 12V Battery. You need a garage door opener that has a "learn" button on it so it can synchronize with the transmitter.