The working principle of EAS: Electronic anti-theft tags which are applied to small、valuable and high—theft merchandise will give an alarm when thief take stolen items passing the exit door installed a detector, just like boarding check at the entrance of the airport. However, a usual shopping can lead to invalidation of the tags while passing the cash desk, and they won’t alarm by exit door.

I    Detector: Made up of a sendor and receiver, and its span is 0.9—1.5 meters.

II   Deactivator: Let the soft labels invalidated, thus won’t give an alarm while passing the detector.

III  Soft label: Attached to small、valuable and high—theft merchandise.

IV   Hard tag: Using repeatedly, being fit for clothe、shoes and knit goods.

VI   Detacher: Takeing hard tags off in POS.