1) High-tech access 2) Hotel room opener 3) Modern hotel room opener
Found on
https://www.crosswordclues.com/clue/cardkey
Cardkey is the name of the company that started an industry and were based in Chatsworth, California. They were the first company to develop and widely distribute `Electronic Access Control Systems`. Once a division of Greer Hydraulics, Inc., in January 1999 they were bought out by Johnson Controls, a company whose founder invented the electric .....
Found on
http://en.wikipedia.org/wiki/Cardkey
No exact match found.
