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.
Stamford is a town on the River Welland in Lincolnshire, England, 92 miles (148 km) north of London on the A1. The population at the 2011 census was 19,701. The town has 17th and 18th-century stone buildings, older timber-framed buildings and five medieval parish churches. Stamford is a frequent filming location. In 2013 it was rated the best place to live in a survey by The Sunday Times.