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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. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   Previous generations of wireless security cameras relied on analogue technology; modern wireless cameras use digital technology with usually more secure and interference-free signals. [167] Wireless mesh networks have been used for connection with the other radios in the same group. [ 168 ]

4. Pan–tilt–zoom camera - Wikipedia

   en.wikipedia.org/wiki/Pan–tilt–zoom_camera

   The compact, unobtrusive nature of PTZ cameras allows churches to keep their buildings' aesthetic value intact while still maintaining security. Instead of taking up valuable floor space with a camera operator stationed at each camera, PTZ cameras are strategically placed to record and broadcast events in high definition on projection screens ...

5. Liquid-crystal display - Wikipedia

   en.wikipedia.org/wiki/Liquid-crystal_display

   Small LCD screens are common in LCD projectors and portable consumer devices such as digital cameras, watches, calculators, and mobile telephones, including smartphones. LCD screens have replaced heavy, bulky and less energy-efficient cathode-ray tube (CRT) displays in nearly all applications since the late 2000s to the early 2010s.

6. Flat-panel display - Wikipedia

   en.wikipedia.org/wiki/Flat-panel_display

   Information on two types of flat-panel display at the Zürich Hauptbahnhof railway station: an orange LED display (top right) and a LCD screen (bottom). A flat-panel display (FPD) is an electronic display used to display visual content such as text or images.

7. List of flat panel display manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_flat_panel_display...

   Flat-panel displays are thin panels of glass or plastic used for electronically displaying text, images, or video. Liquid crystal displays (LCD), OLED (organic light emitting diode) and microLED displays are different kinds of flat panel displays. This list includes LCD, OLED and microLED display manufacturers.