No sound comes out. VIE Support December 28, 2016 08:21 Updated Please make sure if your sound source (ex smartphone, audio devices) are connected via bluetooth or 3.5mm audio jack. [How to set up the bluetooth with the smartphone] [Does it have the AUX input?] Check the volume is "0". Related articles Does it have the AUX input? When one side of the earbud does not play sound I can't to power on the headphones. Can't connect bluetooth. Can't charge the earphones Comments 0 comments Please sign in to leave a comment.