MOST PEOPLE WOULD AGREE that they turn their motion detectors off at night when they are home sleeping. With that in mind, the only protection between you and an intruder are the reed switch door and window contacts that can be easily defeated by a common magnet. And if the motion detectors are turned on, they only provide a benefit AFTER an intruder is inside your home. Multiple layers of security defense is always a good idea. But given a choice, detecting intruders from outside your home is a much more reassuring than detecting them while they’re inside your home.   >>