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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. Closed-circuit television camera - Wikipedia

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

   Vandal dome-style camera. 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 ...

4. Mass surveillance in the United States - Wikipedia

   en.wikipedia.org/wiki/Mass_surveillance_in_the...

   The practice of mass surveillance in the United States dates back to wartime monitoring and censorship of international communications from, to, or which passed through the United States. After the First and Second World Wars, mass surveillance continued throughout the Cold War period, via programs such as the Black Chamber and Project SHAMROCK.

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. IP camera - Wikipedia

   en.wikipedia.org/wiki/IP_camera

   The market size of home security systems reached $4.8 billion in 2018. It had a compound annual growth rate of 22.4% between 2011 and 2018. [15] People in countries that suffer from high crime rates, particularly robbery and theft, are keen to adopt home security cameras. The US and China have a high implementation rate of residential security ...

7. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   There were an estimated 30 million surveillance cameras in the United States in 2011. [85] Video surveillance has been common in the United States since the 1990s; for example, one manufacturer reported net earnings of $120 million in 1995. [86] With lower cost and easier installation, sales of home security cameras increased in the early 21st ...