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It uses a Micro USB connection.
Yes.
There is no volume control on the Edifier earbuds.
Please ensure the charging case is correctly connected with the power source.
1) Check if the earbuds are operating.
2) Check if the earbuds' volume is at an appropriate level.
3) Check if the earbuds are correctly connected to the mobile phone.
4) Check if the earbuds are operating within a normal working range.
1) Check if the mobile phone is in an area with a strong signal.
2) Please ensure the earbuds are within an effective distance (10m) without obstacles between the earbuds and mobile phone.
Please ensure the paired device supports AVRCP (Audio Video Remote Control Profile) profile.