NOOK User Guide Power and Charging 17To turn your NOOK on, display the touchscreen, awaken your NOOK from sleep, or cause yourNOOK to sleep, press the power button for about 1 second and then release it.To turn your NOOK off, press and hold the power button for about 5 seconds, until the readingscreen is white and the touchscreen is dark. Then release the power button.Power ManagementYour NOOK uses quite modest amounts of power compared to a laptop computer. It uses a smallamount of power to turn a page on the reading screen, but no power to keep the page displayed.The touchscreen does use power when it is lit. After 72 hours of sleep, your NOOK turns offautomatically to conserve battery charge.To allow you to manage power use, and to give you the experience that suits your reading habits,you can configure two inactivity periods:• Touchscreen timer: Time from last touchscreen activity until the touchscreen backlightis turned off. You can choose among 10, 30 (the default), and 60 seconds. The touchscreenbacklight is dimmed by 50% after half of this time period (5, 15, or 30 seconds). To set thetouchscreen timer, tap settings > Display > Touchscreen timer.• Sleep timer: Time from last activity (touchscreen or button presses) until your NOOK sleeps.During sleep, a screensaver image is displayed on the reading screen and the touchscreen is unlit.You can choose among 2, 5 (the default), 10, 15, and 20 minutes. To set the sleep timer, tapsettings > Display > Sleep timer.Low Charge AlertsYour NOOK has two low-charge alerts:Low charge alert:When the battery charge is rather low (about 15% charge), your NOOK displays a message tocharge it. You can dismiss the message and continue using your NOOK, but you should charge it assoon as possible. To extend the time that the charge lasts, you can turn Airplane mode on, whichdisables all wireless connectivity. If you turn Airplane mode on, you cannot access your online digitallibrary, The Daily, the Shop, or browse the web.After your NOOK displays the low charge alert, it might turn off wireless connectivity.When it does, you will not be able to access the your online digital library, The Daily, theShop, or browse the web until you charge your NOOK.Critically low charge alert:
