How to open the supermarket alarm

Do you know how to open the supermarket alarm, everyone should understand that supermarket products generally have two kinds of anti-theft devices, one is a small magnetic strip, commonly known as "soft standard", and the other is a pin-type magnetic device, commonly known as "Hard standard", they all use the principle of magnetic induction to prevent theft. The alarm device at the entrance of the supermarket is also called "anti-damage door", which is equipped with a magnetic sensor. If the product passes through the damage prevention door without degaussing, it will alarm. After the customer selects the goods and pays at the checkout counter, the cashier will degauss the goods with “soft standard” and “hard standard”. If it is “soft standard”, degauss the degaussing on the cash register, if it is “ The hard label will use a special tool to hold the "hard label" and the product. In this way, the goods purchased by the customer can safely pass the "damage prevention door".

How to open the supermarket alarm

1. The detector is generally composed of two parts, a transmitter and a receiver. The basic principle is to use a transmitting antenna to transmit a scanning band, form a scanning area between the transmitting antenna and the receiving antenna, and use the receiving antenna to receive and restore the frequency band in the receiving range, and then use the resonance principle of electromagnetic waves to search. Whether a valid tag exists within a specific range, and an alarm is triggered when a valid tag appears in the area.

2. The internal structure of the electronic tag is an Lc oscillation circuit, which is installed on the commodity in a special way. It can only be released by a dedicated decoder or unlocker. Electronic labels appearing on the market include soft labels, hard labels, wine bottle protectors, milk powder anti-theft labels, CD/tape protection boxes, and the like.

3. The decoder is a device that fails the soft tag. Commonly used in the market is a contactless decoder, as long as the salesperson can pass the tag within 20cm above the decoder to decode. The decoder can be used with the POS laser cash register platform. The unlocker is a device that removes various hard tags quickly, conveniently and simply. The above is a brief introduction by the China Security Network Xiaobian about how to open the supermarket alarm.