I bought a dress from a mainstream shop. The item didn’t have a tag on nor a price tag, so the cashier had to manually enter the price. When I left the store the alarm didn’t set off but a machine that the security guy was holding started beeping. He approached me, showed me a tablet that had the item I bought on and asked me if I have a receipt for it , which I did, but I had to walk in and out the store again until the machine stopped beeping.
How does this alarm system work?
In: Other
The one you mentioned would be RFID. There’s a sticker somewhere with an antenna and a tiny chip in it. The reader sends a burst of radio waves, the antenna in the sticker picks that up and uses it to power the chip, then the chip sends its id code back. Ideally your inventory system would track which item is purchased so the anti-shoplifting scanner will just ignore it. https://www.youtube.com/watch?v=0QKrHi-G9WQ
The older type is magnetostrictive. these don’t have any unique identification, there’s just a signal, and the presence of one of the tags disrupts it. If demagnetized it no longer disrupts the signal it in the same way, letting the tag be deactivated. https://www.youtube.com/watch?v=KAm7qAKAXwI
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