These devices are a vital part of a home alarm system. As long as these sensors are undisturbed, the system will read the area as okay and secured. These magnetic sensors can also be attached to a locking mechanism. What this means is the door can then resist pressures of up to one ton in situations where an intruder is attempting to gain entry by means of brute force.
Having such a lock in place will also prevent exit via the door while the seal remains in place. Where there is an emergency situation the seal can be broken by simply pressing an emergency button that is only available to people on the inside of the house.
However, the magnetic lock will seal again once the door or window is again closed. There are also security experts that warn of an explosion if flammable materials are exposed in such a set up.
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