The keypad has two different roles. One is that it starts the security commands. The second one is that it monitors the status of the system. There is an alphanumeric keypad with an LED display. This is usually put near the front door so that you can reach it easily when you come in and out of the house. There is a panic switch that can also be used if there is an emergency and a bypass function. This can be used to monitor parts of the house while leave the others where people are unmonitored.

A sensor is used to protect around the house and large open areas within the house. These are used as magnetic door switches, window vibration detectors, and also window acoustical detectors. These can be put on doors or windows so that people can not break in a window or door without sounding the alarm. The space sensors inside the home help to detect someone who has broken inside the home.

A door switch is made of a magnet and switch. This switch is placed on a door and also on a wooden frame and then when the door opens the magnet moves form the switch. This opens the switch and the alarm goes off.

A window acoustic and vibration detector work by noting if glass breaks. This will make the alarm go off and so it is hard to enter if one breaks glass or windows since the alarm will sound.

A motion detector protects you by noting the change in infrared energy in someone comes in a room when the alarm is set. This will go off if an intrude enters. You can also get some in different models including standard, safe for pets, and for the backyard, which are harsher.

A security panel is the crux of the system. This watches of the sensors and powers the whole operation. This also connects to the telephone wires and has all of the options for the system programmed.

A camera is important because this show pictures of anyone trying to enter on a monitor. It is good for arresting people and iding them properly later one.

A monitor is used to display video info that taken in by cameras. This info is then transmitted through cables to the monitor.

The switchers are used to process images taken by more than one camera. This allows someone to switch different cameras to get a view of the total area.