Barnes & Noble Nook Tablet ユーザーガイド

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Barnes & Noble NOOK Tablet User Guide
Configuring Power Settings
Your NOOK features a PowerSave Mode that fine-tunes your NOOK’s performance to save power and extend its 
battery charge. By default, PowerSave Mode is turned off.
To turn on PowerSave Mode, do this:
1.  On the Settings screen, tap Power Save
Your NOOK displays the Power Save settings page.
2.  Tap the PowerSave mode checkbox. Leave the checkbox checked.