Bowers & Wilkins PERFORMANCE - PX draws on decades of Bowers & Wilkins design experience to take you to the very heart of the music with its breath-taking performance. ADAPTIVE NOISE CANCELLATION - Perfect sound anywhere - on a plane, in the street or in the office. The best adaptive noise cancelling headphones, customizable to your exact preference. Battery life- Up to 22 hours BT/ANC. Up to 29 hours BT/no ANC. Up to 33 hours ANC/wired. Up to 50 hours wired/no ANC. FEEL MORE OF YOUR MUSIC - Built with the same drive units from our P9 Signature headphones, the PX provides optimized listening performance. We have also subtly angled the drivers to provide a more natural stereo perspective. Impedance: 22 ohms (passive). This headset just sits on my shelf after I switched to earbuds. Totally functional, in good condition. Well used. But lots of life in my babies. Comes with charging wire of course. Real fans of the brand will appreciate the item for sure. If you want to have a totally fresh look of them, new ear cushions are about $19 on Amazon.