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[special sound filter]: the earbuds are equipped with a special sound filter, which helps to eliminate environmental background noise, but it will not completely close your ears. you can still hear the alarm clock and other important sounds.[two-layer three-layer structure]: the professional version of the earplugs adopts a 3-layer umbrella structure, which can reduce the impact of sound waves on the eardrum three times and better protect the hearing washable, the service life can reach 3 years