I use a period of three days. There have been no lapses in quality control found so far. Even at the highest volume, one's ears do not become fatigued by the sound, and one's head does not buzz. If I may say so, the sound has a certain degree of intelligence to it (an exclusively subjective assessment, since there were TBIs). decent bass. Someone remarked about the lack of midrange frequencies, probably correctly, however for someone who is not interested in music, this is not a significant issue. AliExpress was used to make the purchase. For the price, I was unable to find anything better. On the next three days, you will get in two exercises at the gym, each lasting between one and two hours, and, of course, on the day of purchase, you will play your favorite music and go for a stroll (about 2-3 more hours). The battery was only partially in its slot. I moved the smartphone ten meters away from where I was standing in the corridor, and the sound continued unabated.
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