Radio-frequency identification uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio recei
FasTrak, a 915 MHz RFID tag used for electronic toll collection in California
RFID hard tag
Electronic key for RFID based lock system
RFID antenna for vehicular access control
The Thing (listening device)
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The Thing, also known as the Great Seal bug, was one of the first covert listening devices to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Uni
Radio-frequency identification
…In 2024, about 50 billion tag chips were sold, according to Atlas RFID and RAIN Alliance webinars in July 2025. In 1945, Leon Theremin invented the "Thing", a listening device for the Soviet Union that retransmitted incident radio waves with the added audio information. Sound waves vibrated a diaphragm…
Replica of The Thing which contained a Soviet bugging device, on display at the NSA's National Cryptologic Museum
Replica of the Great Seal, on display at the NSA's National Cryptologic Museum