LIFTMASTER model 813LM transmitter. It transmits using on frequency MyQ (310, 315, 390 MHz). It has 3 button(s).
The warranty on the 813LM garage door transmitter is 1 year from LIFTMASTER.
The model 813LM is still available.
LIFTMASTER model transmitter instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
(0.34 MB in English) This requires Acrobat 10 or higher