Large chassis for optimal sound quality. The 43 mm drivers of the PX7 are the largest drivers used in any headphone model. They were developed by the same engineers responsible for the 800 Diamond series speakers used in Abbey Road Studios. Adaptive noise cancellation that automatically responds to your environment to keep the outside world away from your music. In 30 hours, you can accomplish a lot. Enough time to, for example, fly from California to London and back. All of this is possible with a single charge without interruption. And if that's not enough, a quick charge of just 15 minutes gives you an additional 5 hours of playtime. The PX7 follows your every movement. When you lift one ear cup, the PX7 automatically pauses your music. Playback resumes as soon as you lower the ear cup again. The PX5 and PX7 headphone models use carbon fiber composite materials, similar to those in modern motorsport, which provide maximum strength and durability.