NOISE CANCELLING WIRELESS HEADPHONES: The perfect balance of quiet, comfort, and sound. Bose uses tiny mics to measure, compare, and react to outside noise, cancelling it with opposite signals. QUIET AND AWARE MODES: Choose Quiet Mode for full noise cancelling, or Aware Mode to bring the outside into the around ear headphones and hear your environment and your music at the same time. UP TO 22 HOURS BATTERY LIFE: Enjoy 22 hours of battery life from a single charge.