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The reverse is true of an interior siren; however, the sound level will not be very pronounced outside of the home. The advantage of having audible sirens, whether the sound is louder inside or outside, is debatable. On one hand, the siren lets intruders know that police have been alerted, which may deter them from taking any further action, while some intruders may still proceed. Audible exterior sirens are also beneficial if you live in a populated neighborhood with neighbors close by, as they will hear the alarm; however, the audibility of the siren may be marginally beneficial if you live in a remote area where neighbors’ homes are out of range. Many of today’s security cameras have something called a motion detector installed. This is—as it sounds—a device that’s capable of detecting movement.

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So protecting all doors is a must.

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Disadvantages:One of the main disadvantages and is mainly caused by a malfunction is the generation of a false alarm where it can be triggered accidentally and thus cause unnecessary inconvenience.

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Perhaps, the increase in terror threats has made many governments and individual to procure the services of private security firms because of the in surveillance and undercover operations.