The Xiaomi smartphone reduces sound after connecting Bluetooth earphones

Several factors will make the sound reduce when playing sounds with the Bluetooth earphones, such as sound volume adjustment, interference to the Bluetooth signal and sound source.
We apologize for any inconvenience it caused. New standard of audio and video, information and communication device is formulated for IEC (International Electrotechnical Commission). New standard restricts the sound pressure to protect your hearing health. Therefore, relevant specifications were adjusted on the phone of the latest version. Thanks for your understanding.