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.
Brackley is a market town in South Northamptonshire, England, on the borders with Oxfordshire and Buckinghamshire. 19 miles (31 km) from Oxford and 22 miles (35 km) from Northampton. Historically a market town based on the wool and lace trade, it was built on the intersecting trade routes between London, Birmingham and the Midlands and Cambridge and Oxford. Brackley is close to Silverstone and home to the Mercedes AMG Petronas F1 Team.