Door Alarm - Door alarms notify others of someone leaving the property. They are frequently installed in any facility where someone may leave from the wrong exit or without permission. Door alarms reduce theft and make it easier to monitor where people enter and exit without sacrificing fire safety.
Door Prop Alarm - They help keep energy costs down by ensuring the doors are closed. An intelligent circuit senses the external magnet location automatically, sounding an alarm when the door has been open too long, and automatically rearms when the door has been closed again; requires no waiting for the key holder to arrive.