SENNHEISER SIGNATURE SOUND Powered by Sennheisers audiophile-inspired 42mm transducer system for exceptional high-fidelity soundTOP-TIER BATTERY LIFE LESS CHARGING TIME Outstanding battery life with up to 60-hours play back time with fast charging. Includes audio cable for continued use even when the battery is depleted. Approx. 2 hrs for full charge 5 min charging for up to 4 hrs playtime Remark Ambient temperatures 30C may lead to extended charging timesADAPTIVE NOISE CANCELLATION AND TRANSPARENCY MODE Advanced noise cancellation automatically adapts your sound to your surroundings. Transparency Mode lets you hear external sounds without removing your headphonesPREMIUM COMFORT Lightweight design features a padded headband and deep cushioned earpads to ensure exceptional and long-lasting.