Bose QuietComfort Ultra Wireless Noise Canceling Over-Ear Headphones (White Smoke) - Manual (Page 14)

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HEADPHONE CONTROLS
POWER ON
Press the Bluetooth /Power button.
You hear a tone, and a voice prompt announces the battery level. The status light
glows according to the current charge level (see page 38).
NOTES:
• When you power on the headphones and hear the tone, the audio is personalized to
your ears for the best audio performance.
• The headphones must be on your head for the tone and voice prompt to play.