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.
Wisbech (/ˈwɪzbiːtʃ/ WIZ-beech) is a market town and civil parish in the Fens of the Isle of Ely, Cambridgeshire, England. It had a population of 31,573 in 2011. The town lies in the far north-east of the county, bordering Norfolk and only 5 miles (8 km) south of Lincolnshire. The tidal River Nene running through the town centre is spanned by two bridges. Before the Local Government Act 1972 came into force in 1974 Wisbech was a municipal borough.