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2. S-mount (CCTV lens) - Wikipedia

   en.wikipedia.org/wiki/S-mount_(CCTV_lens)

   Three S-mount lenses with different focal lengths (left to right: 16 mm, 6 mm and 8 mm) The S-mount is a standard lens mount used in various surveillance CCTV cameras and webcams . It uses a male metric M12 thread with 0.5 mm pitch on the lens and a corresponding female thread on the lens mount.

3. Wireless security camera - Wikipedia

   en.wikipedia.org/wiki/Wireless_security_camera

   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.

4. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   The cameras are used to record details such as gender, age, and ethnicity. Cameras have been used in a southern Chinese city to issue tickets to people for infractions. [85] In India, the cities of Hyderabad and Delhi, the capital, have around 900,000 and 450,000 cameras, respectively. [83]

5. Closed-circuit television camera - Wikipedia

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

   These cameras do not require a video capture card because they work using a digital signal which can be saved directly to a computer. The signal is compressed 5:1, but DVD quality can be achieved with more compression (MPEG-2 is standard for DVD-video, and has a higher compression ratio than 5:1, with a slightly lower video quality than 5:1 at best, and is adjustable for the amount of space to ...

6. Hot shoe - Wikipedia

   en.wikipedia.org/wiki/Hot_shoe

   An internal camera circuit connects the center contact and shoe mount to trigger the flash. The magnitude and polarity of the voltage between the contacts on the flash in the open-circuit condition has varied between different flash units; this is of no consequence for a simple electromechanical contact on the camera so long as the energy is ...

7. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms.