The Bose QuietComfort Ultra Earbuds (2nd Gen) are wireless in-ear earbuds built for listeners who want the best noise cancellation available in a compact form factor, without settling on sound quality or fit. CustomTune technology measures the shape of your ear canal at startup and tailors both the noise cancellation and audio output specifically to you — not a generic preset, but a calibration that's unique to your ears every time. This generation builds on an already strong foundation by adding built-in wireless charging to the case, a refined ActiveSense algorithm for smoother noise cancellation handling, AI-powered SpeechClarity for clearer calls in noisy environments, and Cinema Mode that spatializes audio for a more immersive video experience. Nine combinations of ear tips and stability bands ensure the earbuds stay securely in place whether you're commuting, working, or working out.

Key Features:

Improved ActiveSense Noise Cancellation The updated algorithm handles sudden spikes in ambient noise more smoothly than before — a passing train or a siren won't cause an abrupt disruption to your audio. Aware Mode, Bose's equivalent of transparency mode, lets you hear your surroundings clearly without removing the earbuds, with natural-sounding passthrough.

CustomTune Personalized Calibration When you put the earbuds in, they play a brief calibration tone to measure your ear canal shape, then automatically adjust ANC performance and sound tuning based on the result. In the 2nd Gen, you can also re-run this calibration anytime through the Bose app — a useful addition the 1st Gen lacked.

SpeechClarity with AI and Bone Conduction Eight microphones combined with AI-based audio processing — originally developed for hearing aid technology — isolate your voice from background noise. The earbuds also use bone conduction pickups to sense vibrations from your own voice, helping the system distinguish your speech from ambient sound even more accurately. Call quality is among the clearest available in wireless earbuds at this price.

Cinema Mode Spatial Audio Cinema Mode uses Bose TrueSpatial processing to take stereo audio and expand it into a theater-like soundstage that feels like it's coming from in front of you rather than inside your head. Practical for watching content on a phone, tablet, or laptop.

Built-In Wireless Charging Case The 1st Gen required a separately purchased cover for wireless charging. The 2nd Gen includes it natively. The case supports both wireless charging and USB-C, and holds enough charge for three full top-ups of the earbuds, bringing total battery life to 24 hours.

Bluetooth 5.3 with aptX Adaptive Supports SBC, AAC, and aptX Adaptive — the latter enabling 24-bit hi-res wireless audio with low latency on compatible devices. Bluetooth Multipoint lets you stay connected to two devices simultaneously, switching seamlessly between them. Android users get Google Fast Pair for quick setup.

Nine Fit Combinations for Stability Three ear tip sizes and three stability band sizes give you nine different combinations to find the fit that works for your ears. The stability bands press gently against the concha of your ear to keep the earbuds from shifting during movement, without causing discomfort over long listening sessions.

IPX4 Water Resistance Rated IPX4, meaning the earbuds handle sweat and light water splashes without issue. Suitable for gym use, outdoor workouts, or commuting in light rain.

Fast Charging A 20-minute charge in the case gives you up to two hours of playback — a practical feature when you're short on time before a flight or a long meeting.