Electronic article surveillance systems
Electronic article surveillance (EAS) is a technological method for preventing shoplifting from retail stores or pilferage of books from libraries. Special tags are fixed to merchandise or books. These tags are removed or deactivated by the clerks when the item is properly bought or checked out. At the exits of the store, a detection system sounds an alarm or otherwise alerts the staff when it senses active tags. For high-value goods that are to be manipulated by the patrons, wired alarm clips may be used instead of tags.
There are several major types of electronic article surveillance systems:
Magnetic, also known as magneto-harmonic
Acousto-magnetic, also known as magnetostrictive
Video surveillance systems(to some extent)
REMEMBER: EFFECTIVE ELECTRONIC ARTICLE SURVEILLANCE SYSTEM REDUCES YOUR LOSSES TO 95-99%.