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Earplug
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===Nonlinear earplugs=== Nonlinear earplugs provide similar advantages to electronic earplugs but do not require electricity. They are designed with a thin diaphragm which allows the amount of noise reduction to increase in proportion to the sound level to which the wearer is exposed.<ref>{{cite web |title=#234 Hearing Protection for Impulse Noise |url=https://multimedia.3m.com/mws/media/1087488O/hearing-protection-for-impulse-noise-technical-bulletin.pdf |website=multimedia.3m.com |publisher=3M Personal Safety Division}}</ref> This makes them useful for applications where situational awareness is required but noise protection is also necessary, such as the military or police.
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