Mystery button help
I have a E500 W211 that is ex Japan so no manual.
I have managed to figure everything out to date but last night I found a mystery button that I can't figure out and thought you guys will be able to help

It is up by the read view mirror. It has a flap that comes down and it is a inch square red button.
My guess is this is for a garage door remote?? If it is how do I program it???
All/any help appretiated.
Cheers
The garage door openers are the three small buttons next to the l.e.d. light on the bottom of the mirror.
I have no idea if a TeleAid system designed for Japan would work in NZ, since the system depends upon the local cellular network for its operation and that varies by country.
Mystery solved



