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2. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   Some alarm systems are tied to video surveillance systems so that current video of the intrusion area can be instantly displayed on a remote monitor and recorded. Some alarm systems use real-time audio and video monitoring technology to verify the legitimacy of an alarm.

3. Home security - Wikipedia

   en.wikipedia.org/wiki/Home_security

   Door and window sensors are also implemented in most home security systems. One part of the system is installed on the door or window itself while the other part is installed on the frame of the door or window. The two part system connects securely when a door or window is closed, creating a security circuit. [5]

4. 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.

5. Vivint - Wikipedia

   en.wikipedia.org/wiki/Vivint

   In 1999, Keith Nellesen and Todd Pedersen co-founded APX Alarm Security Solutions in Provo, Utah. [4] [5] At the time, the company sold and installed security systems. [4] APX Alarm Security Solutions rebranded as Vivint in February 2011. [4] [6] Vivint was acquired by The Blackstone Group in November 2012. [7]

6. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   [93] [94] [95] New York City's Domain Awareness System has 6,000 video surveillance cameras linked together, [96] there are over 4,000 cameras on the subway system (although nearly half of them do not work), [97] and two-thirds of large apartment and commercial buildings use video surveillance cameras.

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