RFID
参考速通卡

The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945. Because it was passive, needing electromagnetic energy from an outside source to become energized and active, it is considered a predecessor of radio-frequency identification (RFID) technology.


【 在 yonghhu 的大作中提到: 】
: 如题，毫瓦级功耗
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修改:Qlala FROM 61.48.133.*
FROM 61.48.133.*