LIFTMASTER model 320LM receiver. It receives using on frequency 390 MHz.
The warranty on the 320LM garage door receiver is 1 year from LIFTMASTER.
The model is discontinued.
LIFTMASTER model 320LM receiver instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_320lm_om.pdf
(0.15 MB in English) This requires Acrobat 10 or higher