LIFTMASTER model 813LM transmitter. It transmits using dip switch code (fixed) 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 813LM transmitter brochure in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_813lm_brochure_16.pdf
(1.88 MB in English) This requires Acrobat 10 or higher