What is the use of the alarm system at the exit of major supermarkets in Jinan?

The buttons on clothes, shoes and other items in the supermarket are called magnetic buttons, which are equipped with electromagnetic sensors that can interact with the electromagnetic exit. However, in some stores in Jiahua or RT Mart, some magnetic buckles are out of order and don't ring when going out. But I advise you not to take risks, hehe.

For other items, the store will randomly sprinkle some magnetic powder on the bar code and degauss it under the action of the scanning gun. Of course, if the code is taken out without scanning, the electromagnetic induction door will also alarm. Not all goods are sprinkled with magnetic powder, and the cost is too high. The shop just sprinkled some selectively. But as far as I know, only a few goods have magnetic powder, so what is lost in the store every day adds up to a great loss. Of course, thieves are caught almost every day. So stealing in the store depends on luck, hehe.

These are all hardware measures. In every store, there are also special plainclothes field investigators, who are called internal security personnel. These people wander around the store every day and see suspicious people following his ass. These people are natural enemies of thieves.

I have worked in Jiahua and RT Mart Shanshui Store and Tianqiao Store before, and I know this better.