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2. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   Listening devices of the East German security services. A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations.

3. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   While low-quality domestic kits are cheap, the professional installation and maintenance of high definition CCTV is expensive. [43] Gill and Spriggs did a cost-effectiveness analysis (CEA) of CCTV in crime prevention that showed little monetary saving with the installation of CCTV as most of the crimes prevented resulted in little monetary loss ...

4. Webcam - Wikipedia

   en.wikipedia.org/wiki/Webcam

   Webcam mounted on a building, used as a CCTV. Webcams can be used as security cameras. Software is available to allow PC-connected cameras to watch for movement and sound, recording both when they are detected. These recordings can then be saved to the computer, e-mailed, or uploaded to the Internet.

5. Shure SM57 - Wikipedia

   en.wikipedia.org/wiki/Shure_SM57

   The microphone kit (two SM57 microphones, windscreens, microphone stands, and black right-angle XLR cables) is referred to as the VIP/high-profile microphone kit. The SM57 is a popular choice of musicians due to its sturdy construction and ability to work well with instruments that produce high sound pressure levels , such as percussion ...

6. 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 ...

7. The #1 Nutrient to Help You Sleep When You’re Traveling ...

   www.aol.com/lifestyle/1-nutrient-help-sleep...

   For more sleep-supporting magnesium when you’re away from home, try these foods. Start Your Day with Whole Grains. Whole grains like oats and whole-wheat cereal are easy ways to work some ...