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. What kind of motion it detects depends on the user’s custom settings.