Could I adjust the size of these headphones on my head?
Of course, the headband is made from high-quality stainless steel. Simply adjust them by straightly bending out these Edifier headphones.
Why does the red light flashes?
These headphones are at a low battery level. You should charge them right away.
Why can't I hear any sound?
Please check the following points:
1) Are these headphones' volumes at an appropriate level?
2) Are these headphones correctly connected to your mobile phone?
Why can't I call with these headphones?
Please check the following points:
1) Is your mobile in an area with a strong signal?
2) Are the headphones beyond the effective working distance (10m) with your mobile phone?
3) Is there any obstacle between your mobile phone and these headphones?
Why the red light is off when I charging these headphones?
Please note the battery will be in the SLEEP mode if these headphones haven't been used for a long time. Charge and wait for 30 minutes then the red light will be on again.
Why can't I control my songs
Please make sure the paired device supports AVRCP (Audio/Video Remote Control Profile).