LIFTMASTER model 877MAX keyless entry. It transmits using billion code on frequency 315.
The warranty on the 877MAX garage door keyless entry is 1 year from LIFTMASTER.
The model 877MAX is still available.
LIFTMASTER model keyless entry instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
liftmaster_877max_om.pdf
(1.86 MB in English) This requires Acrobat 10 or higher