Electronic Article Surveillance, or EAS, is an anti-shoplifting system used by retail businesses.
It involves attaching an electronically detectable tag to the item of clothing or merchandise.
Nowadays, a lot of merchandise has these tags incorporated into their packaging.
In other cases, the tags have to be attached by the store.
When the item is purchased, the tag is either removed or deactivated Tags are typically removed from clothing, while merchandise with the tag incorporated into packaging are usually passed over a pad.
The detectors are located at the store exits. If one of the active tags passes through the detectors, an alarm goes off.