Power Button
On the left side of your NOOK is the power button. Press and hold the button for 2 seconds to turn on your
NOOK. To learn more about power management for your NOOK, see "Power and Charging".
Headphone Jack
Along the top edge of your NOOK, you'll find a 3.5 mm audio jack—a standard size jack for headphone and ear
buds.
Microphone
You'll also find a built-in microphone set into the top edge of your NOOK.
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Barnes & Noble NOOK Tablet User Guide