Crossword Genius

Electronic door opener (3)

Ross

I believe the answer is:

fob

(Other definitions for fob that I've seen before include "It is worn hanging from a watch-chain" , "Ornament worn on a watch-chain" , "Waistcoat pocket" , "Ornament worn on watch chain" , "Chain attached to watch" .)

I've seen this clue in the Newsday.
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