The working principle of preventing others from stealing in shopping malls

supermarket goods are generally equipped with two kinds of anti-theft devices, one is a small magnetic stripe, commonly known as "soft label", and the other is a pin-type magnetic device, commonly known as "hard label", both of which use the principle of magnetic induction to prevent theft. The alarm device at the entrance of the supermarket is also called "loss-proof door", which is equipped with magnetic sensors. If the goods pass through the loss-proof door without degaussing, an alarm will be given. After the customer selects the goods and pays at the cashier, the cashier will degauss the goods with "soft label" and "hard label". If it is "soft label", it will be degaussed on the degausser on the cashier surface. If it is "hard label", a special tool will be used to separate the "hard label" from the goods. In this way, the goods purchased by customers can safely pass through the "loss-proof door".