At first, I did not like it, I even thought about returning it. Bigger, bad fit in the ears, weak sound. Changed the liners from the kit. Surprisingly, the smallest ones came up, and everything changed) The sound is pleasant, bass, mids, highs. I downloaded the sound generator, you can hear from 15 to 15000 Hz. But, everyone has their own perception thresholds, and the sound generator, on android, via bluetooth .)) This range is definitely audible. I didn't set up anything special, I plugged it in and that's it. The right button works as a start-pause, the left one - the next track. I like.
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