The 43mm drivers in the Px7 are the largest in our headphone collection built and tuned by the same engineers behind the Bowers & Wilkins 800 Series diamond speakers used in Abbey road studios. Cancels noise clean out adaptive noise cancelling that automatically. Responds to your environment to keep the outside world out of the music. 30 hours of battery life. A 15 minute quick charge gets you 6 more hours. Px7 obeys your every move. Lift an ear cup to hear what’s happening around you and the music automatically stops, put it back and the music plays on. The carbon fiber composite arms of the Px7 mimic the strength and agility of the fastest vehicles in the world channeling pure sound to you and holding up against everyday wear and tear.