MARANTEC model M13-631 keyless entry. It transmits using billion code on frequency 315.
The warranty on the M13-631 garage door keyless entry is 1 year from MARANTEC.
The model M13-631 is still available.
MARANTEC model keyless entry instructions and owners manual in PDF format at NO CHARGE!
VIEW / DOWNLOAD by clicking HERE
(0.82 MB in English) This requires Acrobat 10 or higher