LIFTMASTER model 312HM receiver. It receives using on frequency 315 MHz.
The warranty on the 312HM garage door receiver is 1 year from LIFTMASTER.
The model is still available.
LIFTMASTER model 312HM receiver instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_312hm_om.pdf
(0.17 MB in English) This requires Acrobat 10 or higher