How does Bluetooth headset switch voice? English-Chinese

There are four common methods for switching between Chinese and English in Bluetooth headsets:

First, after the Bluetooth headset is turned on, press the volume button at the same time to switch the Bluetooth headset language between Chinese and English.

2. Turn off the Bluetooth of the mobile phone, then enter the pairing mode, and click or double-click the multifunction key or pause key.

Third, when you enter the pairing mode, double-click the volume+key and hear the beep, which means that you have successfully switched between Chinese and English.

Fourth, if the volume key of the Bluetooth headset is sliding, you need to press the sliding key twice.

Please refer to the following schematic diagram: