LIFTMASTER model 81LM transmitter. It transmits using on frequency 390 MHz. It has 1 button(s).
The warranty on the 81LM garage door transmitter is 1 year from LIFTMASTER.
The model 81LM is still available.
LIFTMASTER model transmitter instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
(0.13 MB in English) This requires Acrobat 10 or higher