If you're interested in a hard-wired security system, you can install the wiring yourself. Systems that include a monitoring service will probably require that you allow them to install the actual components, but you can install your own components if you don't use such a service. A basic security system (figure A) works well in small apartments. Such a system typically monitors four separate areas, or "zones," of your home. You'll need a more advanced system (figure B) for a larger residence. Larger systems can accommodate up to 32 zones and may be upgraded with expansion modules.
Most starter systems can monitor eight zones in your home. Such systems are controlled by keypads, which are available in large or small models (figure C) as well as models that include LCD displays (figure D).
Security systems start by monitoring your doors and windows. They do this with magnetic sensors (figure E) that trigger a signal when the magnetic components are moved too far away from each other. Another type of door sensor is known as a dome switch (figure F). A dome switch has a spring-loaded trigger that is pressed in when the door is closed over it.
If an intruder manages to get past your first set of defenses, your motion detectors (figure G) will detect him. If you have small pets, you'll probably want to use a "pet-immune" motion detector, which will be triggered only by animals weighing 85 pounds or more. Another option for large open areas is the 360-degree motion detector, which is mounted on the ceiling.
If you're interested in high-tech gadgets, consider installing a motion detector with a built-in camera (figure H). If you find the $800 price tag a bit daunting, install a standard security camera (figure I) instead. Such cameras can be tied through your monitoring system so that you can use your computer at work to check your house.
Glass-break sensors (figure J) monitor sounds in your home. If your windows are broken or cut, the sensors will sound the alarm.
Intercom stations (figure K) may be used to communicate with people in other parts of the house. In some high-end systems monitoring services can use the intercom to contact you if they detect a problem.
Other security-system options include outdoor photo monitors (figure L), smoke alarms (figure M) and remote controls to arm and disarm your system (figure N).
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