Bose QuietComfort 45 Noise-Canceling Wireless Over-Ear Headphones (White Smoke) - Manual (Page 16)

HEADPHONE CONTROLS
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POWER ON
On the right earcup, slide the Power/ Bluetooth switch to the right.
A voice prompt announces the battery level, and the status light glows according to
the current charge level (see page 29).
Standby timer
The standby timer conserves the battery when the headphones are not being used.
To set up and customize the standby timer, use the Bose Music app.