EAS is a technology used to identify articles as they pass through a gated area. This identification is used to alert someone that unauthorized removal of items is being attempted. EAS systems are useful anywhere there is an opportunity for theft of items of any size. The primary environment for an EAS system is retail stores; however, an increasing number of warehouses and distribution centers are installing the equipment.

Three types of EAS systems dominate the retail industry: radio frequency (RF), electromagnetic (EM) and acousto magnetic (AM). A fourth technology, microwave (MW), was the first technology used for anti-theft systems and is far less reliable and accurate than the three aforementioned systems. In each technology, an EAS tag or label is attached to an item. The EAS tag/label is in an active state when guarding against product theft. When in the active state, a tag will sound an alarm if passed through the detection field located between EAS pedestals.

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Honeywell Electronic Article Surveillance (EAS)