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2. Electrical equipment in hazardous areas - Wikipedia

   en.wikipedia.org/wiki/Electrical_equipment_in...

   As a general guide for Zone 2, unwanted substances should only be present under 10 hours per year or 0–0.1% of the time. [3] Unclassified locations Also known as non-hazardous or ordinary locations, these locations are determined to be neither Class I, Division 1 or Division 2; Zone 0, Zone 1 or Zone 2; or any combination thereof.

3. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Protection of a 1-dimension zone is easier and requires only one or two microphones and speakers to be effective. Several commercial applications have been successful: noise-cancelling headphones , active mufflers , anti- snoring devices, vocal or center channel extraction for karaoke machines , and the control of noise in air conditioning ducts.

4. Landing Zones 1 and 2 - Wikipedia

   en.wikipedia.org/wiki/Landing_Zones_1_and_2

   Landing Zone 1 and Landing Zone 2, also known as LZ-1 and LZ-2 respectively, are landing facilities at Cape Canaveral Space Force Station used by SpaceX. They allow the company to land the first stage of its Falcon 9 rocket or the two side boosters of its Falcon Heavy rocket. The facilities were built on land leased in February 2015 on the site ...

5. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

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   These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...

6. These noise-canceling headphones are just as good as ... - AOL

   www.aol.com/lifestyle/noise-canceling-headphones...

   Plus, more than 4,000 shoppers have given them five stars.

7. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   A hearing protection device, also known as a HPD, is an ear protection device worn in or over the ears while exposed to hazardous noise and provide hearing protection to help prevent noise-induced hearing loss. HPDs reduce the level of the noise entering the ear. HPDs can also protect against other effects of noise exposure such as tinnitus and ...