LIFTMASTER model 33LM transmitter. It transmits using on frequency 390 MHz. It has 3 button(s).
The warranty on the 33LM garage door transmitter is 1 year from LIFTMASTER.
The model 33LM is discontinued.
LIFTMASTER model transmitter instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_33lm_om.pdf
(0.32 MB in English) This requires Acrobat 10 or higher