The sound only comes out of the right earphone. There are no instruction manuals for these particular headphones in the box or anywhere online. The Revain Help is generic and not intended for these headphones. There are no buttons to turn on or reset the headphones. Even after it is fully charged, the charging case display shows that the charge is draining away quickly. The brand is listed as TOP, but it is impossible to find a real manufacturer on the web. Biggest waste of money!
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