Which of the following devices is commonly used by staff to unlock secure doors with a wireless signal?
Badge readers
Motion sensors
Key fobs
Biometric scanners
Key fobs are small proximity tokens that contain an RFID or NFC chip and antenna. When the fob is brought within range of a reader, it transmits a unique wireless credential that the access-control system validates to unlock the door. Smart cards can perform the same function in card form and may require either insertion (contact) or very close "tap" proximity for contactless operation, but a key fob is designed to hang on a key ring and usually needs only to be within range-no insertion is required. Motion sensors, biometric scanners, and badge readers are associated components of a security system, but they are not the handheld wireless credential used by staff.
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