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Bose QuietComfort Ultra Bluetooth Earbuds (2nd Gen), Wireless Noise Cancelling earbuds, Up to 6 hours battery, IPX4 Rating, Immersive Audio, Deep Bass, Midnight Violet - Limited Edition Card Slots the smallestWORLD CLASS NOISE CANCELLATION: The best noise cancelling of any Bose earbuds is now even better than before. ActiveSense technology smooths spikes in surrounding sound, so even in Aware Mode distractions wont get in the way. CUSTOMTUNE TECHNOLOGY: CustomTune technology analyses your ears and adapts your in ear headphones to their shape. The result? World class noise cancellation and custom sound for bigger chills every time you press play. QUIET OR