A conventional fire system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present.
These alarms may be activated automatically from wired smoke detectors, and wired heat detectors or may also be activated via manual fire alarm activation devices such as manual call points or pull stations. Alarms can be either motorized bells （the better is fire alarm bells ）or wall mountable sounders or horns or siren alarms
They can also be speaker strobes which sound an alarm, followed by a voice evacuation message which warns people inside the building not to use the elevators or other hazardous equipments。
Of course, fire alarm sounders can be set to certain frequencies and different tones including low, medium and high, depending on the country and manufacturer of the device. Most conventional fire systems in Europe sound like a siren with alternating frequencies. Fire alarm electronic devices are known as horns in the United States and Canada, and can be either continuous or set to different codes. Fire alarm warning devices can also be set to different volume levels.