When the security salesman comes to your home and says you just can't get along without this bell or that whistle, remember that your main intent is to keep burglars out of your house - nothing more, nothing less.
Homeowners need to school themselves a little before buying an alarm system. Basically, what you want to protect first is the perimeter of the building - be it house or business - to keep burglars out. Then, knowing that even the best perimeter protection has holes in it, you want to protect the interior traffic patterns to detect burglars inside. Beyond those two options, everything else is essentially unnecessary in a normal security system.
It makes no difference, whether you've got a 20-room mansion or a three-bedroom house, the options are essentially the same. Only the scale is different.
Next, buyers should be aware of some of the equipment available. First, you should know what you want your system to do. Do you want simply a local alarm that sounds a siren, or do you want a monitored system where security operators notify the police in the event of a problem?
The next consideration should be the type of protection needed - basic perimeter protection or a combination of perimeter and interior protection. Perimeter protection is always the first concern.
If at all possible, you want to keep the burglar outside. This means knowing a little about where the normal points of entry are. Most burglars enter through doors or first-story windows, with doors being the overwhelming preference because many people inadvertently leave doors unlocked, providing burglars an easy access point.
Doors can be protected with magnetic switches that alert a control panel when the doors - locked or unlocked - are opened, and windows can be equipped with, a variety of devices to announce an intruder.
Magnetic contacts are very much in use, but more and more people are going to shock sensors that detect movement in the window frame when a pane is broken.
Suppose the burglar that decides to break into your place decides on a less sophisticated means of entry - such as a concrete block through your plateglass window that has magnetic contacts on it. What then?
That's where interior traps come in. You've got to assume a burglar can get by the basic perimeter system through broken windows, holes in the roof or wall or something of that nature.
The most common form of interior detection is the infrared motion sensor, which picks up minute changes in body heat, a burglar walking down the hallway for example.
Homeowners who choose a security system monitored by a central station have to know who they're working with, said Harris.
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