Edit: to clarify. I’m talking about these vertical things near the entrance, which set an alarm off if you bring something unpaid for close
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I’m not sure if I can write enough words for ELI5:
Sensors by the door don’t work for everything, it’s only certain high value items, such an item will have a little strip on them that the cashier passes over something several times to deactivate when you buy it. I guess the strip is probably an RF chip, but I’m not sure.
If you try to pilfer something that doesn’t have this tag, the alarm will not go off, but the store may or may not have other loss prevention measures such as people monitoring cameras that would watch you try to steal the other thing.
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