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2. Wireless security camera - Wikipedia

   en.wikipedia.org/wiki/Wireless_security_camera

   Analog wireless is found in three frequencies: 900 MHz, 2.4 GHz, and 5.8 GHz. Currently, the majority of wireless security cameras operate on the 2.4 GHz frequency. Most household routers, cordless phones, video game controllers, and microwaves operate on the 2.4 GHz frequency and may cause interference with a wireless security camera.

3. Hidden camera - Wikipedia

   en.wikipedia.org/wiki/Hidden_camera

   A hidden camera can be wired or wireless.Hidden cameras are connected, by cable or wirelessly, to a viewing or recording device, such as a television, computer, videocassette recorder, network video recorder, digital video recorder, memory card, or another data storage medium.

4. List of digital camera brands - Wikipedia

   en.wikipedia.org/wiki/List_of_digital_camera_brands

   BuckEye Cam - long range wireless camera systems; Bushnell - trail cameras; Brica; Cambo - large format cameras, architectural cameras and repro cameras designed for digital backs; Contour - wearable HD action cams for video and capable of taking stills; Covert - trail cameras; Creative - webcams only; previously offered compact digital cameras

5. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   The Great Seal bug was hidden in a copy of the Great Seal of the United States, presented by the Soviet Union to the United States ambassador in Moscow in 1946 and only discovered in 1952. The bug was unusual in that it had no power source or active components, making it much harder to detect—it was a new type of device, called a passive ...

6. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The Thing consisted of a tiny capacitive membrane connected to a small quarter-wavelength antenna; it had no power supply or active electronic components. The device, a passive cavity resonator , became active only when a radio signal of the correct frequency was sent to the device from an external transmitter.

7. Secret photography - Wikipedia

   en.wikipedia.org/wiki/Secret_photography

   Erich Salomon took images of European summit meetings and a session of the US Supreme Court in secret using an Ermanox camera hidden in his hat. Some classic early U.S. street photography – such as that of Paul Strand on the Lower East Side [2] – was obtained by fixing a second "dummy lens" to the camera, whereas the real shot was taken ...