Voice prompts are the vocal cues produced by the headset, such as those to indicate when the headset is in pairing mode or how much battery time is remaining. If you like, you can switch these prompts off and replace them with less obtrusive 'beeps'.
To do so, please first ensure that headset is on but not in use (i.e. no active call or music reproduction). Now press and hold the multifunction button and the volume control toggle simultaneously for five seconds until you hear the voice prompt "voice on" or "voice off" to indicate the current state.
Please note that the volume toggle must be pressed up into the headset, not to the left or right.
Unfortunately, the language of the voice prompts cannot be changed, only disabled.