Bose Ultra Open Earbuds with OpenAudio Technology, Open Ear Wireless Earbuds, Up to 48 Hours of Battery Life, Black

* Testing conducted by Bose with audio playback at a loudness of 75 dBA. Battery life varies based on settings and usage. ** Testing conducted by Bose by inserting battery-depleted earbuds into a fully charged case, charging to 100% (or until the case battery was depleted), playing audio at a loudness of 75 dBA until earbud battery depletion, and repeating until case battery depletion. *** Testing conducted by Bose by removing fully charged earbuds from the case, connecting to a phone with no content playing, and maintaining connection until earbud battery depletion.