Rancho Santa Fe Security designs, installs, tests, inspects and services most fire alarm systems. The purpose of a fire alarm system is to detect a fire and provide warning to building occupants to evacuate the premises. Automatic devices, such as smoke and heat detectors, sense the fire and then activate audiovisual devices. These audio-visual devices, such as horns, speakers, and strobes, act to notify the occupants of a building about an emergency situation. Manual pull stations also activate the audio-visuals, but rely on a person to operate them. Fire alarm systems must be thoroughly inspected annually in accordance with NFPA 72.