Supermarket goods will report to the police when they leave the security gate, and the goods are labeled with anti-theft labels.

There are two kinds of anti-theft labels: soft and hard. If you pay attention, some wine or milk powder has something like a spring, and some clothes have something like a nail, which is hard. Soft is a thin piece of paper.

When passing through the checkout counter, the cashier must degauss the anti-theft label (hard disassembly and soft degaussing). If it is not magnetic, it will not alarm.

I have also read the post on Taobao, and it is estimated that the shoes are labeled as anti-theft in the garage and ready to be put on the shelves in physical stores. But someone bought it online, and the owner took it out of the garage directly (there was no degaussing procedure for the cashier), so the shoe store in the online store also called the police.