A fire alarm system warns people when smoke, fire, carbon monoxide or other fire-related emergencies are detected. These alarms may be activated automatically from smoke detectors and 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 or wall mountable sounders or horns. 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. 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 fire alarm 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.
Oadby is a small town in Leicestershire, three miles south east of Leicester city centre. The town is famous for Leicester Racecourse, situated on the border between Oadby and Stoneygate, and the University of Leicester Botanical Garden. Oadby had a population of 23,849 in 2011 and like its neighbour Wigston, Oadby is made up of five wards and is one of several satellite towns surrounding Leicester. The Borough of Oadby and Wigston is twinned with Maromme in France, and Norderstedt in Germany.