How do clothing security tags work?

How do they become detatched? Magnets? Any ideas on how they operate?

How do clothing security tags work?
Excerpts from http://securitytags.biz/





Security Tags refer to the sensor tags, hard tags, paper tags, security labels, AM tags, RF tags and other EAS tags detected at the front door of a retail location by a security detection system. These security tags serve the function of alerting a retailer that security tags or sensor tags along with the clothing they are protecting are leaving the store.





Security tag detachers refer to the security tag removers, magnets or locking mechanism openers located at the check out area of a retail location. These Tag Detachers serve the function of opening up the security tag and allowing the security tag or sensor tags removal from a garment. Every security hard tag system needs a detcher.



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