CCTV system in which signals are not publicly distributed but are monitored, primarily for surveillance and security purposes
An interactive whiteboard (IWB) is a large interactive display that connects to a computer the computer using a pen, finger.
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen.
A security alarm is a system designed to detect intrusion – unauthorized entry – into a building or area.Security alarms are used in residential
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