in fact, this is the acousto-magnetic soft tag: the electronic anti-theft tag belongs to the electronic goods anti-theft (EAS) technology, and the unauthorized goods are identified by the detection system placed at the entrance or exit of the supermarket or the cashier channel. The detection target is the anti-theft soft tag affixed to the goods (one-time use) or the anti-theft hard tag nailed to the clothing, shoes and hats (reusable). When a label that has not been processed by the cashier (soft label has not been degaussed or hard label has not been removed) passes through the system, the system will give an alarm to remind the staff.