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  2. Closed-circuit television - Wikipedia

    en.wikipedia.org/wiki/Closed-circuit_television

    The system is used by Chicago's Office of Emergency Management in case of an emergency call: it detects the caller's location and instantly displays the real-time video feed of the nearest security camera to the operator, not requiring any user intervention. While the system is far too vast to allow complete real-time monitoring, it stores the ...

  3. How to Build a Pinhole Camera to See the Total Solar Eclipse ...

    www.aol.com/pinhole-projector-watch-solar...

    The total solar eclipse arrives on Monday, April 8, and is visible across Mexico, the USA, and Canada. Catch a glimpse with this DIY pinhole camera.

  4. 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.

  5. Solar camera - Wikipedia

    en.wikipedia.org/wiki/Solar_camera

    A number of photographers, inventors and photographic businesses contributed to the design development of the solar camera. An antecedent was the solar microscope of c.1740, [5] employed in experiments with photosensitive silver nitrate by Thomas Wedgwood and Humphry Davy in making the first, but impermanent, photographic enlargements.

  6. 'Bright and reliable': These motion-sensor solar security ...

    www.aol.com/lifestyle/bright-reliable-motion...

    You can't ignore 19,000 five-star reviews! It's not easy to find solar lights that actually work and stand the test of time — save 65%.

  7. Home security - Wikipedia

    en.wikipedia.org/wiki/Home_security

    Some forecasts project the home security market as a whole will be worth $47 billion by 2020, [12] with the DIY home security market worth $1.5 billion. [13] While the market for home security is expanding, especially with cable TV and Internet service providers introducing their own security and home automation products, it is a fragmented ...

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