door opener

noun
1.
a mechanism that automatically opens a door, as of a garage, when actuated by a radio transmitter, electric eye, or other device.
2.
Informal. something that is effective in leading to opportunity or success: Sales experience can be a door opener for young executives.
Also, door-opener.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
And if they steal the garage door opener, too, they may be able to get inside
  the house with ease.
So now they have his car keys, his garage-door opener, and his address from the
  registration.
Apparently this is more acceptable than permanent alterations, even though the
  door opener is still a visual intrusion.
If you own an electric garage door opener, know how to open the door without
  power.
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