Some reviews write about a quiet sound or bass. This problem doesn't really exist. You just have to remember to turn up the volume of the headphones themselves, not the phone. To do this, in the touch panel settings, select "long press" - increase the volume on any of the headphones. Zoom in to full by holding your finger on the earpiece. And then adjust the volume with your phone. Enough for your eyes and ears of this volume and bass!
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