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2. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

3. The Mosquito - Wikipedia

   en.wikipedia.org/wiki/The_Mosquito

   The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...

4. Active Denial System - Wikipedia

   en.wikipedia.org/wiki/Active_Denial_System

   The Active Denial System ( ADS) is a non-lethal directed-energy weapon developed by the U.S. military, [ 2] designed for area denial, perimeter security and crowd control. [ 3] Informally, the weapon is also called the heat ray[ 4] since it works by heating the surface of targets, such as the skin of targeted human beings.

5. Have a dog that won’t stop barking? An expert tells ... - AOL

   www.aol.com/dog-won-t-stop-barking-195838107.html

   What does work is finding out why your dog is barking, and shaping your prevention strategies around that. ... Burch said purchasing an anti-barking device could also be a possible solution ...

6. Anti-lock braking system - Wikipedia

   en.wikipedia.org/wiki/Anti-lock_braking_system

   An anti-lock braking system ( ABS) is a safety anti- skid braking system used on aircraft and on land vehicles, such as cars, motorcycles, trucks, and buses. [ 1] ABS operates by preventing the wheels from locking up during braking, thereby maintaining tractive contact with the road surface and allowing the driver to maintain more control over ...

7. Shock collar - Wikipedia

   en.wikipedia.org/wiki/Shock_collar

   A typical shock collar. Shock collar used on a riot police dog in 2004 in Würzburg.Two years later, [1] Germany banned the use of shock collars, even by police. [2]A shock collar or remote training collar, also known as an e-collar, Ecollar, or electronic collar, is a type of training collar that utilizes electronic stimulation to the neck of a dog, at high levels this can cause pain or be ...