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Wireless security cameras function best when there is a clear line of sight between the camera(s) and the receiver. If digital wireless cameras are outdoors and have a clear line of sight, they typically have a range between 250 and 450 feet. If located indoors, the range can be limited to 100 to 150 feet.
Hidden cameras are often considered a surveillance tool. The term "hidden camera" is commonly used when subjects are unaware that they are being recorded, usually lacking their knowledge and consent; the term "spy camera" is generally used when the subject would object to being recorded if they were aware of the camera's presence.
During World War II, the Nazis took over a Berlin brothel, Salon Kitty, and used concealed microphones to spy on patrons. Also during the war, the British used covert listening devices to monitor captured German fighter pilots being held at Trent Park. In the late 1970s, a bug was discovered in a meeting room at the OPEC headquarters in Vienna.
A wireless IP camera. A growing branch in CCTV is internet protocol cameras (IP cameras). It is estimated that 2014 was the first year that IP cameras outsold analog cameras. [157] IP cameras use the Internet Protocol (IP) used by most local area networks (LANs) to transmit video across data
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Internet of things devices also have access to new areas of data, and can often control physical devices, [273] so that even by 2014 it was possible to say that many Internet-connected appliances could already "spy on people in their own homes" including televisions, kitchen appliances, [274] cameras, and thermostats. [275]
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