The call quality of the headphones are not good. Check if the headphones are operating within a normal working range.Check if the headphones are correctly connected with mobile phone.Check if the headphones volume are at an appropriate level.When the headphones have not been used for long periods of time, the battery will enter sleep state, it needs to charge about 30 minutes and then the red light will be lit.Ensure the charging device is correctly connected with the headphones.The headphones are at low battery level, please recharge the headphones. Restore to factory settings: when powered on and not connected (or in pairing state), press and hold the volume up and volume down buttons simultaneously for 3 seconds, wait until the blue light flashes rapidly, and then the factory settings have been restored.
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