https://techcrunch.com/2022/09/07/bose-reduces-size-and-amps-up-noise-canceling-for-the-299-quietcomfort-earbuds-ii/

Yes, I missed Bose’s big news this morning. I was busy with…other stuff. You, too, would be forgiven for missing the QuietComfort Earbuds II launch, under the deluge of Apple news (including its own new buds), but Bose makes very good headphones, and any new version of its flagship products deserves a mention.

The new buds are a third smaller than their predecessor and bring big improvements to noise canceling — which has long been Bose’s bread and butter. To accomplish the latter, each bud sports four microphones — with three on the outside and one on the inside. These detect ambient noise and counteract the sound accordingly in “less than a fraction of a millisecond,” per the press material.