In fact, this is the acousto-magnetic soft tag: the electronic anti-theft tag belongs to the electronic commodity anti-theft (EAS) technology, which identifies unauthorized goods through the detection system placed at the entrance or exit of the supermarket or the cashier channel. The detection object is the anti-theft soft label (disposable) attached to the commodity or the anti-theft hard label (reusable) nailed to the clothing, shoes and hats. 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 alert the staff.