Exceptional quiet, comfort, and amazing sound. This is the power of Bose QuietComfort® headphones: the best combination of noise cancelling, sound performance, and comfort. With the added Adjustable EQ, you can tune the music to your preferences and the enjoyment begins with the first listen. The Acoustic Noise Cancelling™ technology is the result of over 50 years of research that cancels external noise using a reverse-phase signal, resulting in quieter and higher-quality music. You can choose from Quiet Mode for full noise cancellation, Aware Mode to hear environmental sound when needed, or Custom Mode to tailor the sound to your liking. An incredible listening experience also requires a level of comfort to match. With its smooth ear cushions without creases, luxurious velvety synthetic leather, and minimal clamping force, you will almost forget you are wearing headphones — even after hours of listening. QuietComfort® headphones deliver up to 24 hours on a single charge, enough to last even the longest overnight flight. They fully recharge in just 2.5 hours and a 15-minute charge will give you up to 4 hours of use. For even longer playback time, connect the included audio cable for wired mode use.