Independent Use of a Single Bud Sometimes you only want to use one of your QuietComfort Earbuds II, even though they sound fantastic when combined. With Independent Single-Bud Use, you can now listen and make calls using either the left or right earbud. With this new feature, you can switch between your earbuds with ease and continue listening to the other earbud uninterrupted even if the first one runs out of battery or disconnects from Bluetooth. Make sure the QuietComfort Earbuds II's software is up to date in order to utilize Independent Single-Bud Use. Note: This update is accessible via OTA (Earbuds ONLY) on the Bose Music App. Compared to earlier Bose wireless earbud updates, this is different. The charging case for the QC Earbuds II does