How do the retail shop theft alarms work?

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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?

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7 Answers

Anonymous 0 Comments

Usually they have a little clasp attached to the price tag that is removed once you make a purchase. I’m not sure how else they can track the item.

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