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2. 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 ...

3. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   See also: Plug (jewellery) Pre-molded earplugs (left), formable earplugs (center), and roll-down foam earplugs (right) An earplug is a device that is inserted in the ear canal to protect the user's ears from loud noises, intrusion of water, foreign bodies, dust or excessive wind. Since they reduce the sound volume, earplugs may prevent hearing ...

4. Earmuffs - Wikipedia

   en.wikipedia.org/wiki/Earmuffs

   Earmuffs refer to two different items. Both items consist of a thermoplastic or metal head-band that fits over the top or back of the head, and a cushion or cup at each end to usually cover both ears. The cups can either be clothing accessories designed to cover a person's ears for warmth or personal protective equipment designed to cover a ...

5. Plug (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Plug_(jewellery)

   A plug (sometimes earplug or earspool ), in the context of body modification, is a short, cylindrical piece of jewelry commonly worn in larger-gauge body piercings. [1] Modern western plugs are also called flesh tunnels. Because of their size—which is often substantially thicker than a standard metal earring —plugs can be made out of almost ...

6. Stretching (body piercing) - Wikipedia

   en.wikipedia.org/wiki/Stretching_(body_piercing)

   Stretching (body piercing) Stretching, in the context of body piercing, is the deliberate expansion of a healed piercing for the purpose of wearing certain types of jewelry. Ear piercings are the most commonly stretched piercings, [ 1] with nasal septum piercings, tongue piercings and lip piercings / lip plates following close behind. [ 2]

7. Hearing aid - Wikipedia

   en.wikipedia.org/wiki/Hearing_aid

   A modern behind the ear hearing aid with a minicell battery. Behind the ear hearing aids are one of two major classes of hearing aids – behind the ear (BTE) and in the ear (ITE). These two classes are distinguished by where the hearing aid is worn. BTE hearing aids consist of a case which hangs behind the pinna. The case is attached to an ...