What types of devices are commonly used in security surveillance?

CCTV cameras, motion detectors, and alarm systems are essential components of security surveillance because they work together to monitor and protect premises effectively. CCTV cameras provide continuous visual monitoring, allowing security personnel to observe live feeds or recorded footage, which aids in identifying potential threats or criminal activities. Motion detectors enhance security by sensing movement and triggering alerts, ensuring any unauthorized activity is quickly detected. Alarm systems serve as a responsive mechanism, alerting occupants and law enforcement to breaches or emergencies, thus providing a comprehensive protective measure. These tools are integral to creating a secure environment by enabling proactive monitoring and reactive responses to security incidents.

The other options listed do not align with the primary function of surveillance. Metal detectors and bomb squads, while vital for specific security contexts, are not used for continuous monitoring in the way that surveillance devices are. Fire alarms and extinguishers pertain to fire safety rather than security surveillance. Personal communication devices, although important for coordinating security responses, do not contribute directly to the surveillance aspect.