Eli5: how do anti theft radio frequency tags know i bought an item

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for context i just bought 3 bags of beef jerky from 5 below and they all had one of those square tags with the lines on them and i only scanned one 3 times at the self checkout how do they get deactivated

Edit [https://imgur.com/a/c3DFJFg](https://imgur.com/a/c3DFJFg) here’s a picture of it

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17 Answers

Anonymous 0 Comments

Assuming OP is referring to tags like [these ones](https://a.co/d/1T2mWwm).

Ever wonder why at self checkout you must put all items in the bagging area, there’s a device that deactivates the tag within a certain proximity.

At grocery stores its common to see the cashier slide the item over a separate small (usually gray or black plastic spot on the register) which deactivates them, some are now built in to the barcode reader area.

You must have put them all in the bagging area hence close enough to be deactivated.

I was in Safeway a few months ago and did a similar thing, had 2x boxes of Spindrift, scanned one, put it in the bag area then went to scan the other but the barcode was scraped so put that one in the bag area and grabbed the first one to scan again and it stopped me, on the screen it showed the view from a camera overhead which showed me swapping the items (each one had a box and number on it in the video), and it called the employee over to check on it.
Was Vegas cardroom level security at a Safeway self checkout.

But for your question it’s a proximity sensor, not foolproof but works pretty well!

If you click the link and scroll down you’ll see what a stand deactivation device looks like (recessed gray square built into the check out stand), nowadays for self checkout they are a bit larger and built into the “bagging area” underneath and not visible.

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