a) Ensure volume is set to maximum through Mobile Phone itself

b) Use suitable size of eartips and wingtips

c) Use other music APP/music player as different songs/videos app have different audio quality with different Mobile Phones

d) Ensure cleaning of eartips and validate this by image and ask customer to clean it carefully

Steps to Reproduce Solution

Control the volume from Mobile Phone

You can find different size of ear tips and wingtips in accessories box

Different music APP customer can download from APP Store

Do not use any sharp object to clean ear tips