LIFTMASTER model 891LM transmitter. It transmits using on frequency MyQ (310, 315, 390 MHz). It has 1 button(s).
The warranty on the 891LM garage door transmitter is 1 year from LIFTMASTER.
The model 891LM is still available.
LIFTMASTER model transmitter instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_891lm_om.pdf
(2.07 MB in English) This requires Acrobat 10 or higher