>First, you have to turn Bluetooth off on your Smartphone.
>Make sure that your Bluetooth headphones/headset will not automatically connect to any device.
>Now, turn the Bluetooth headset on.
>Press and hold then release when the light indicator turns on.
>Wait until the light blinks or the headset enters search mode.
>Double press the power button.
>It will change the voice language.
>And that's it!