Headphones need to be warmed up, otherwise the sound quality will not be very good, many bloggers do not understand this on video reviews when testing headphones out of the box. Normally, they start working only after warming up. I returned my headphones, because. I think that for such money the product should be completely satisfied, and not be a compromise. I do not advise you to buy, they are not convenient, you will not be able to fully use them.
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