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A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations. Self-contained electronic covert listening devices came into common use with ...
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 camera. 8 mm × 8 mm lens with a built-in image sensor, used for a mini camcorder. A hidden camera or spy camera is a camera used to photograph or record subjects, often people, without their knowledge. The camera may be considered "hidden" because it is not visible to the subject being filmed, or is disguised as another object.
Surveillance cameras used in houses are IP cameras or closed circuit. IP cameras connect over the internet and stream to users’ phones using a Wi-Fi connection. 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.
Kyocera - as of 2005, only cameraphones; previously offered compact digital cameras. Largan - compact digital cameras. LG - compact digital cameras. Minolta - compact digital cameras and two unique DSLRs, acquired by Sony in early 21st century. Mamiya - medium-format cameras which accept digital camera backs.
Secret photography. A still from a covertly taken video by RAWA showing Taliban members beating a woman in public. Secret photography is the use of an image or video recording device to photograph or film a person who is unaware that they are being intentionally photographed or filmed. It is sometimes called covert photography.
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