The Magnetic Contact Switch for Door Monitoring System easily mounts to a door and door frame to detect opening. When door is opened and the connection is broken and resident wearing a wrist transmitter is within 10-14 feet, the alarm will sound alerting the caregivers. Features: • Easy installation For Use With: • Anti-Wandering Door System (TL-4005SYS) • Anti-Wandering Door System (TL-4005HOME)