Security systems are integrated systems made up of different types of equipment and devices, the combined operation of which helps protect human lives, property, the environment and information. Crime prevention literally represents preventing violation of the law and public interests and disturbances to social order through acts of crime, which should be punished by law. Crime prevention facilities and equipment are classified as shown in Figure 1-2. Long-distance picture transmission systems and surveillance camera systems are encompassed within CCTV systems designed for crime prevention.

The aims of the installation of crime prevention facilities are to let criminals know the risks of crime and function as a deterrent of crime or keep constant watch over potential criminal acts. When a criminal act is detected, the facility’s sensors or emergency warning switches are operated to sound an alarm and ideally cause criminals to go elswhere. Thereafter, information is sent to related departments or personnel for taking appropriate
measures to avoid loss.