Mi headphones' problem when listen to music.

Solutions:
1. No sound:
① Whether there is sound when make call, confirm whether the audio source or the music player has problem. It is suggested to download lossless music or try to replace the player.)
② Try to use the headset to connect with other phones/computers/tablets (if other phones/computers/tablets is normal, it will be judged to be caused by the device failure).
③ Check whether the connection position of earphone and mobile phone is caused by bad contact.
④ Apply for after-sales inspection.
2. Noise sound:
① Check whether there is noise in every piece of music (if there is noise in individual music, it may be a sound source problem, download lossless music).
② Check whether there is noise when make call (If the phone is normal, it may be a player problem, it is recommended to replace the player).
③ Check whether the fault is caused by the mobile phone, and suggest to replace other mobile phone/tablet/computer.
④ Apply for after-sales inspection.
3. Voice volume of left and right ears is inconsistent:
① Check whether each music has inconsistent volume (if there is noise in individual music, it may be the sound source problem, download lossless music after trying).
② Check whether there is a difference in the volume of the phone (if the phone is normal, it may be the player problem, it is recommended to replace the player).
③ Check whether the fault is caused by the mobile phone, and suggest to replace other mobile phone/tablet/computer.
④ Apply for after-sales inspection.