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The convenience of a wireless system is tempting when you are purchasing a video surveillance system -you have more flexibility in where you install cameras, and can limit the number of cables you need to run by connecting to the cameras using Wi-Fi internet. Wireless cameras still need power source to function

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surveillance is the monitoring of behavior, activities, or other changing information for the purpose of influencing, managing, directing, or protecting people.This can include observation from a distance by means of electronic equipment (such as closed-circuit television (CCTV) cameras) or interception of electronically transmitted information (such as Internet traffic or phone calls).

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Video door-phone (also known as video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building (residential complex, detached family home, workplace, etc.) with access controlled by audio-visual communication between the inside and outside