Bose QuietComfort Earbuds II are the next generation of wireless listening. Enjoy the best in sound and noise cancellation that is perfectly yours. You always get the best sound quality because CustomTune technology auto-adjusts it to your ears’ liking, personalizing sound to the shape of your ears for an immersive listening experience. Tune out in Quiet Mode when you silence background noise with the world's best noise cancellation. When it's time to pay attention, Aware Mode allows enough transparency to hear your surroundings or engage in friendly conversation.