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Both the QuietComfort Earbuds II and QuietComfort Ultra Earbuds are capable of producing the world-class noise cancellation that Bose is known for. Make sure that you're not in Aware mode with the ActiveSense feature activated in the app - this feature adjusts the noise cancellation depending on your surroundings, but isn't the same has having your earbus in Quiet mode. Our support team will also help you, if further assistance is required.
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