NRS Healthcare ELRO Magnetic Door and Window Alarm - Pack of 3

This NRS Healthcare ELRO Magnetic Door and Window Alarm - Pack of 3 is a pack of warning alarms to alert a carer if a user has opened any door or window, they can be installed directly without additional wires. Fix the alarm unit to the edge of a door or window and the magnetic bar to the door or window frame. When the magnetic contact is broken (by the two parts being separated), the alarm wil...