Exit Alarms are for unlocking a door and sounding an alarm during emergency conditions people of an emergency panic device, or a push bar . The mechanism consists of a spring-loaded metal bar fixed horizontally to the inside of an outward-opening door. When the lever is either pushed or depressed, it activates a mechanism which unlatches the door and sounds alarm allowing occupants to leave quickly from the building. Exit alarms are typically used to notify users of unauthorized exits. They are just as useful as products that alert users when doors are opened, and for entrance into monitored areas.