LIFTMASTER model 850LM receiver. It receives using on frequency 310 MHz, 315 MHz, 390 MHz, MyQ (310, 315, 390 MHz).
The warranty on the 850LM garage door receiver is 1 year from LIFTMASTER.
The model is still available.
LIFTMASTER model 850LM receiver instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_850lm_om.pdf
(0.70 MB in English) This requires Acrobat 10 or higher