Electronic article surveillance (eas) is a technological method for preventing shoplifting.
it usually involves three components:
-electronic antenna
-deactivator or detacher
-electronic tag
-special tags and labels are fixed to merchandise or books. these tags or labels are removed or "deactivated" by the clerks when the item is properly bought or checked out.
-labels are deactived using a "label deactivator".
after a label is deactivated or a tag is removed the customer can then pass by the antenna without any alarm.
at the exits of the store, a detection system sounds an alarm or otherwise alerts the staff when it senses active tags are passing by.