The clue "High-tech hotel door opener" last appeared in the Newsday.com crossword on August 8, 2018. The correct answer for this puzzle is "SMARTCARD", a 9-letter word.
Solution SMARTCARD is 9 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is SMARTCARD with 9 letters, and the shortest is SMARTCARD with 9 letters.
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The solution is 9 letters long.