Bose QuietComfort Earbuds II Noise-Canceling True Wireless In-Ear Headphones (Triple Black) - Manual (Page 21)

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POWER
POWER ON
Press the button on the front of the charging case.
When the charging case opens, the earbuds power on. The earbud status lights (see
page 35) and charging case status lights glow (see page 36).
NOTE: When you remove the earbuds from the charging case, close the case to help
preserve the battery life and keep the case free of debris.