how do the sensory machines at the doors of big shopping chains work? how do they know when someone is walking out of the store without paying for the certain object
In: Technology
Generally, they don’t know that you’re carrying an item that was not sold. Instead, they just know that the sensor was not removed from the product you’re carrying or that is was not deactivated.
That said, some stores are equipped with RFID tags. In these instances, the systems are smart enough to know whether the individual EPC of the tag in your product was scanned by the cash register or not. That’s possible b/c the point-of-sale system records the individual EPC for every item sold. It can then relay that information to the exit readers. If you try to walk out with and EPC that has not been marked sold, the system will alarm.
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