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  2. Wireless security camera - Wikipedia

    en.wikipedia.org/wiki/Wireless_security_camera

    Wireless security cameras are closed-circuit television (CCTV) cameras that transmit a video and audio signal to a wireless receiver through a radio band. Many wireless security cameras require at least one cable or wire for power; "wireless" refers to the transmission of video/audio. However, some wireless security cameras are battery-powered ...

  3. Network video recorder - Wikipedia

    en.wikipedia.org/wiki/Network_Video_Recorder

    A network video recorder (NVR) is a specialized computer system that records video [1] to a disk drive, USB flash drive, memory card, or other mass storage device. An NVR itself contains no cameras, but connects to them through a network, typically as part of an IP video surveillance system. NVRs typically have embedded operating systems.

  4. IP camera - Wikipedia

    en.wikipedia.org/wiki/IP_camera

    An Internet Protocol camera, or IP camera, is a type of digital video camera that receives control data and sends image data via an IP network.They are commonly used for surveillance, but, unlike analog closed-circuit television (CCTV) cameras, they require no local recording device, only a local area network.

  5. Surveillance - Wikipedia

    en.wikipedia.org/wiki/Surveillance

    Surveillance is used by citizens, for instance for protecting their neighborhoods. It is widely used by governments for intelligence gathering, including espionage, prevention of crime, the protection of a process, person, group or object, or the investigation of crime. It is also used by criminal organizations to plan and commit crimes, and by ...

  6. Closed-circuit television camera - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television...

    A closed-circuit television camera is a type of surveillance camera that transmits video signals to a specific set of monitors or video recording devices, rather than broadcasting the video over public airwaves. The term "closed-circuit television" indicates that the video feed is only accessible to a limited number of people or devices with ...

  7. Closed-circuit television - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television

    Surveillance cameras on the corner of a building. Surveillance camera in a residential community. Closed-circuit television (CCTV), also known as video surveillance, [1][2] is the use of closed-circuit television cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the ...

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