LIFTMASTER model 877MAX keyless entry. It transmits using billion code on frequency 315 MHz, 390 MHz, MyQ (310, 315, 390 MHz), Security plus (390 Mhz), Security plus (315 MHz).
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
(1.86 MB in English) This requires Acrobat 10 or higher