A garage door opener is a motorized device that opens and closes garage doors. Most are controlled by switches on the garage wall, as well as by remote controls carried in the garage owner's cars, or more rarely, on keychains.
People having problems with a garage door should start by consulting the owners manual or downloading a copy of the owners manual from the door manufactuer's website.
A malfunctioning garage door can be quite dangerous, as a common action by owners is to activate the quick release mechanism in order to operate the door manually. But once the door is disconnected from the motor the door can start moving downward and injure or even kill a person standing under it.
Read more about Garage Door Opener: The Electric Opener, Remote Control, Cloning Garage Door Opener Remotes, Additional Features, Safety
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—Laurence Sterne (1713–1768)