https://www.theguardian.com/technology/2023/nov/13/bose-qc-ultra-earbuds-review-top-class-noise-cancelling-with-audio-upgrade

New immersive sound and better Bluetooth update for comfortable and popular earbuds

Bose’s commuter favourite QuietComfort earbuds have been given an upgrade, setting the standard with best-in-class noise cancelling and new immersive audio features.