The CPU ( Central Processing Unit )
The control panel is a metal box that contains the circuit boards ( brains ) of the system. The CPU receives instructions from the user through the keypad. It receives information about activity in the premise from the sensors. The CPU also communicates information about the premise to the monitoring station.

The Keypad
The user uses the keypad to talk to the CPU and tell the alarm system what to do. The keypad is used to turn the alarm on and off. It is also used to bypass zones and perform other programming functions.

The Sensors
The sensors are the parts of the system that detect events in the premise and report them to the CPU. They come in many different shapes and designs to detect numerous events.

There are various types of sensors, for example:

- Magnetic contacts for doors and windows

- Motion Sensors

- Smoke Detectors

- Heat Detectors

- Glass Break Detectors

- Cold Temperature Detectors

- Panic Pendants

- Medic Alerts

Other

Alarm systems are available in hardwire or wireless. Hardwire systems simply mean that all the sensors are connected to the CPU by electrical wire. A wireless system uses transmitters and receivers to communicate via radio frequency between the sensors and the CPU. ( there are no wires involved ) reliable and proven wireless technology does exist. wireless systems can be used in areas where running wires is difficult or impossible. They can also be used when people simply so not wish to drill holes and run wires in there premise. they are also common when installing a full perimeter system. Wireless equipment is more expensive due to the transmitters necessary with each sensor. However, installation costs are much less since no wires have to run to the sensors.

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