Door security system. Person swiping a radio frequency programmed key against a sensor. This scanner is being used to open the door at left. Each key

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Door security system. Person swiping a radio frequency programmed key against a sensor. This scanner is being used to open the door at left. Each key has a radio frequency transmitter that produces radio waves, telling the scanner that the person holding the key should be granted access.

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Size: 3670px × 2391px
Photo credit: © PUBLIC HEALTH ENGLAND/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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