Bose QuietComfort Ultra Earbuds Noise-Canceling True Wireless -Black

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World-Class Audio, Noise Cancellation, Comfort/Stability--with Immersive Audio
Improving on the award-winning QuietComfort Earbuds II, the black Bose QuietComfort Ultra Earbuds True Wireless In-Ear Headphones continue to offer high-quality audio, world-class noise cancellation, CustomTune technology that auto-adjusts the noise cancellation and sound performance to your ears' liking, responsive touch controls, and a water- and sweat resistant IPX4 rating--and now immersive audio to take audio performance to an entirely new level.
And with new features like Snapdragon Sound for robust low-latency Bluetooth connectivity, Qualcomm aptX Adaptive codec for achieving the highest-possible audio quality, Google Fast Pair to expedite the initial pairing process, and a new metallic finish, the QuietComfort Ultra Earbuds make listening to music a deeply personal experience.
CustomTune Technology--Sound and Silence Tailored to You
When the earbuds are placed in your ear, a chime is played. The microphone inside the earbud measures the sound in your ear canal and adjusts it to create a perfectly balanced sound for you.
CustomTune technology compensates for the differences in individual ears, as many people's left and right ears are not identical in shape, size, and condition. The result is truly personalized sound balance.
CustomTune also helps by personalizing noise cancellation to the shape of your ears. This may soften unwanted sounds that are hardest to reduce, like voices.
Passive/Active Noise Cancellation
QuietComfort Ultra Earbuds utilize both passive and active noise reduction technologies.
Passive noise reduction is similar to when you wear earplugs; there is a physical blockage preventing some of the sound from entering your ear. This is achieved through the earbud design, with materials such as silicone eartips and the acoustic seal created by having a proper fit.
For active noise cancellation, your earbuds use sophisticated proprietary electronics with microphones both inside and outside the earbuds. The electronics system senses the sound in almost any environment and then measures, compares, and reacts--instant by instant--to produce an opposing cancellation signal.
Listening Modes

Listening modes are preset audio settings that you can select based on your listening preferences and environment. You can choose between three preconfigured modes.
Quiet: Full noise cancellation with Bose-optimized stereo audio. Allows you to block out distractions using the highest level of noise cancellation.
Aware: Full transparency with Bose-optimized stereo audio. Allows you to hear your surroundings while enjoying your audio in stereo.
Immersion: Full noise cancellation with immersive audio set to Motion. Allows you to block out distractions and immerse yourself in lifelike audio.
Custom: You can create up to seven custom modes using the Bose Music app.
Crystal-Clear Phone Calls
QuietComfort Ultra Earbuds have an adaptive microphone system that allows you to use them during calls when connected to any smartphone. In addition to traditional calls, the earbuds work with many apps that use Voice over Internet Protocol (VoIP), such as Teams, Zoom, or FaceTime.
The microphone system adapts to your environment to isolate your voice from competing background noises and wind. In addition, Self-Voice (adjustable in the Bose Music app settings) allows you to hear yourself naturally, as if you weren't wearing earbuds at all, so you can monitor the volume of your voice and minimize the effects of speaking while wearing earbuds.