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2. Talking CCTV - Wikipedia

   en.wikipedia.org/wiki/Talking_CCTV

   A CCTV camera with speakers attached . Talking CCTV is a CCTV surveillance camera that is equipped with a speaker to allow an operator to speak to the people at the ...

3. 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.

4. Closed-circuit television camera - Wikipedia

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

   IP cameras or network cameras are digital video cameras, plus an embedded video server having an IP address, capable of streaming the video (and sometimes, even audio). [3] Because network cameras are embedded devices, and do not need to output an analogue signal, resolutions higher than closed-circuit television 'CCTV' analogue cameras are ...

5. Video management system - Wikipedia

   en.wikipedia.org/wiki/Video_management_system

   A VMS can also be capable of recording audio from network cameras, and may in some cases provide two-way audio through a network camera, acting as an intercom. Typically this requires an external amplifier and speaker by the camera. Some network cameras include a built-in microphone, or may provide external audio I/O connections.

6. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   CCTV monitoring at the Central Police Control Station, Munich, Germany, in 1973 Desk in one of the regional control-rooms of the National Police in the Netherlands in 2017 CCTV control-room monitor wall for 176 open-street cameras in 2017. An early mechanical CCTV system was developed in June 1927 by Russian physicist Léon Theremin. [9]

7. Home security - Wikipedia

   en.wikipedia.org/wiki/Home_security

   Closed-circuit, or CCTV cameras, stream through wired or wireless links. [9] These cameras stream live footage to users, allowing them to watch for suspicious activity. Current cameras feature abilities such as motion detection and two-way audio, allowing users to receive notifications of activity and speak and listen through the camera.