Information about used Sensormatic EAS tags, used eas checkpoint security tags, used Knogo tags, and new AM or RF security tags are available by calling 1-866-Hard-Tag. 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 eas 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.