QuietComfort 25 Acoustic Noise Cancelling headphones provide crisp, powerful sound. At the same time, Bose noise cancelling technology monitors the noise around you and cancels it out, helping you focus on what you want to hear whether its your music, your calls or simply peace and quiet. Theyre also comfortable, durably made and easy to stow, with earcups that pivot to fit in a small carrying case thats easy to take with you. A convenient inline mic/remote is included its compatible with most Samsung smartphones/tablets and select Android? devices. The included AAA battery gives you up to 35 hours of play time. And the addition of unpowered audio enables continued music listening even if the battery runs out. These are headphones engineered to make you love the music you love even more and designed to let you enjoy it all day, every day, wherever you go.