It is necessary to carry it in a guarantee, and the service center in Hong Kong is the same with terrible reviews about the quality of JBL repairs. I regret that I did not take Sony or Sennheiser. I don't recommend these headphones. Pros below: Partially sound, autonomous work through a wire, a wire with a microphone included. Cons: Again, the sound normally reproduces only at a volume of up to 70%, then there are too many high ones, they begin to wheeze. The JBL equalizer is weak, it helps a little bit. Autonomy is terrible: in the first week they sat down by 10% per hour, in the second it was already 20% per hour (I tried the original Xiaomi and Huawei, as well as Baseus. The wire is only the original). There is no mention of any 30 hours.
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