Bose QuietComfort 45 Headphones - WhiteEnhanced Acoustic Noise Cancelling technology uses six discreet microphones to continuously measure, compare and react to outside noise, then cancels it with the opposite signal to minimise distractions. Choose Quiet Mode for full noise cancelling or Aware Mode to hear your environment and your music at the same time. Toggle through the modes with the button on the left earcup The new mic system uses four tiny microphones to better focus on your