The Magnetic Lock is used with the Door Monitoring Systems. When a person wearing a resident wristband comes within 10-14 feet of a door that is being monitored, it will lock down the door for a preset time of 15 to 75 seconds and then unlock. Can be connected into an existing fire alarm system. AC Power Adapter (AC-03) Included. Features: • Easy installation For Use With: • Anti-Wandering Door System (TL-4005SYS) • Anti-Wandering Door System (TL-4005HOME)