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Intruder Alarm

​A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary (theft) or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms.

Some alarm systems serve a single purpose of burglary protection; combination systems provide fire and intrusion protection. Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. There are many types of security systems. Homeowners typically have small, self-contained noisemakers. These devices can also be complicated, multirole systems with computer monitoring and control. It may even include a two-way voice which allows communication between the panel and monitoring station.

​Potters Bar is a town in Hertfordshire, England,[1] 13 miles (21 km) north of central London. In 2011, it had a population of 21,882.[2][n 1] In the 2021 census, the four wards that make up Potters Bar - Bentley Heath & The Royds, Furzefield, Oakmere and Parkfield - had a combined population of 22,536. This includes several smaller outlying hamlets contained in the Bentley Heath & The Royds ward, such as Bentley Heath and Ganwick Corner. In 2022 the population was around 23,325.[3]

Within the historic county of Middlesex until 1965, the town dates to the early 13th century but remained a small, mainly agricultural, settlement until the arrival of the Great Northern Railway in 1850.[4] It is now part of the London commuter belt.[5]