Bowers & Wilkins PX Wireless Headphone

PX headphone Real World Listening features include Environment 
Filter and Voice Pass-through. Environment Filter noise-cancellation 
is optional and can be simply enabled or disabled via a button on the 
headphones. The Voice Pass-through feature enables external sounds, 
such as conversation or safety announcements, to be heard clearly 
without any need to remove the headphones. Environment Filter and 
Voice Pass-through are enabled via the Headphone iOS and Android 
app available. The app also enables certain headphone characteristics 
to be adjusted