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To save battery, you should put your tablet in sleep
mode by turning off the LCD display. To do this, press
the power key and immediately release it. Do it again
to bring up the lock screen.
Sleep Mode
Swipe down from the top of your Home Screen to view
your Notifications.
Use two fingers to swipe from the top of your Home
Screen or swipe down again from notifications to view
your Quick Settings.
Quick Settings & Notifications