Checking the sound quality mode
When you switch the sound quality mode, the indicator flashes in blue to show the current sound quality mode.
When the headset is powered on, press and hold the 
button, then press the NC button within 2 seconds (before the power is turned off), then the indicator flashes in blue to show the current sound quality mode.
“Priority on sound quality” mode: 3 times 
- - - -
SBC, AAC, aptX, or LDAC is selected automatically.
“Priority on stable connection” mode: 1 time
SBC
