Earphone structure Headphones are divided into headset, earplug and hanging ear. Headphones have excellent performance and strong anti-falling ability, but they are large in size and inconvenient to carry and are suitable for use in fixed p...
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Noise pollution is becoming more and more important. Business travel, daily travel or working environment seem to be all around us except when we are asleep. Since we cant control the source of noise, we can only prevent it from entering ou...
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