RFID,

Radio Frequency Identification (RFID) technology uses radio waves to identify people or objects. There is a device that reads information contained in a wireless device or “tag” from a distance without making any physical contact or requiring a line of sight

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• 謝謝科普，漲知識了。以後超市也這樣就好了，節省不少時間。 -betadine- ♀ (0 bytes) () 04/23/2023 postreply 21:57:33