Anti-theft label belongs to the electronic goods anti-theft (EAS) technology. Through the detection system placed at the entrance or exit of shopping malls and supermarkets, anti-theft soft labels stuck on goods or anti-theft hard labels nailed on clothes, shoes and hats (which can be reused) can be identified. 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. The principle is acoustomagnetic system, radio system, etc. Because the appearance and tension of the anti-theft buckle are different, the nail puller of different anti-theft buckles is different. Never open it by force.