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2. Hidden camera - Wikipedia

   en.wikipedia.org/wiki/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.

3. 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.

4. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   Wireless cameras are also easy and inexpensive to install. [166] 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 ...

5. Home security - Wikipedia

   en.wikipedia.org/wiki/Home_security

   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. Current cameras feature abilities such as motion detection and two-way audio, allowing users to receive notifications of activity and speak and listen through the camera.

6. Closed-circuit television camera - Wikipedia

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

   IP cameras or network cameras are digital video cameras, plus an embedded video server having an IP address, capable of streaming the video (and sometimes, even audio). [3] Because network cameras are embedded devices, and do not need to output an analogue signal, resolutions higher than closed-circuit television 'CCTV' analogue cameras are ...

7. RF module - Wikipedia

   en.wikipedia.org/wiki/RF_module

   An RF module (short for radio-frequency module) is a (usually) small electronic device used to transmit and/or receive radio signals between two devices. In an embedded system it is often desirable to communicate with another device wirelessly .