BOSE QC 35 II Quiet Comfort Noise Canceling Headphones. Date of Manufacture : October 3, 2018. Stock # 12-16-21/RLL – 1523035853. Use the Bose Connect app to adjust the level of noise cancellation, enable music sharing, manage Bluetooth connections, and access software updates. Renowned noise cancelling headphones. QuietComfort 35 wireless headphones II are engineered with renowned noise cancellation. With the Google Assistant and Amazon Alexa built-in, you have instant access to millions of songs, playlists and more-hands free. Simply choose your voice assistant and ask away. Voice services (Amazon Alexa, Google Assistant) may vary and may not be available in all languages and countries. What happens when you clear away the noisy distractions of the world? Concentration goes to the next level. You get deeper into your music, your work, or whatever you want to focus on. That’s the power of QuietComfort 35 wireless headphones II. Put them on and get closer to what you’re most passionate about. Proprietary technology continuously monitors and measures outside noise and then cancels it with the opposite signal. But we didn’t stop there. You can also adjust the level of noise cancelling between two levels to better fit your environment. So you can focus – really focus – on what matters. Up to 20 hours battery life. Enjoy up to 20 hours of listening, enough time to pore through this entire playlist. So you can keep the music – or the quiet – going all day long. And when it finally runs down, a quick 15-minute charge gives you another 2.5 hours. For that rare time when you do get caught without battery, use the included cable to plug in and keep the music playing. Tip:without original box. Bose QuietComfort 35 II Wireless Headphones. Up to 20 hours. 3.2 x 6.7 x 7.1 inches. Headphones; Noise Cancelling Headphones.