Crime or disruption detection; these devices usually work in conjunction with guards or other monitoring mechanisms to extend their capacity. It is important to know the factors in choosing CCTV, focal length, lens types (fixed v. zoom), iris, depth of field, illumination requirements. Intrusion Detection systems are used to detect unauthorized entries and to alert a responsible entity to respond. Knowing the different types of IDS systems (electro-mechanical v. volumetric) and changes that can be detected by an IDS system helps great deal in choosing the right setup to depend on.

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