It really bothers me, a little bit of COD but help !!!!!!!!
The one thing appears to be a RFID tag of some sorts, and the other is a antitheft device that triggers those alarm things at the door of many stores.
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Exactly as Steve says. They work as air coils with at least dual resonating natural frequencies activated by RF AC in large diameter windings placed in around the Exit.
A simple radio like detector sets of an alarm when it hears a resonance.
The cashier has a means to permanently turn the air coil when you pay for the product :-)
They are antitheft devices, they would trigger alarms if you left the store without paying for them....