Turning off your Kindle or putting it in Sleep mode extends its battery life. By extending the battery life, you don't have to worry about constantly charging your e-reader and you can continue reading. Turn your Kindle off or put it in Sleep mode and then turn the wireless off if you are in a situation where the device may cause an interference, such as taking off or landing in an aeroplane.
Find the Power switch on the top, left side of your Kindle.
Slide the Power switch to the right and hold it for four seconds until the screen goes blank.
Release the Power switch.
Press the "Menu" button on the right side of your Kindle, near the bottom of the device.
Navigate up to "Turn Wireless Off" with the 5-way controller located directly under the "Menu" button and press the 5-way controller to turn the wireless off. Turn the wireless off if you don't plan on using your Kindle for an extended period of time. In Sleep mode, your Kindle doesn't use any battery power if the wireless is turned off. If you want to continue to receive scheduled subscriptions while in Sleep mode, leave the wireless feature on.
Slide the Power switch over and release it quickly to avoid holding the switch in place too long and turning the Kindle off. One of a number of preset full-screen images appears. Some of the images you might see include a picture of Mark Twain, Charlotte Bronte, Agatha Christie, Ralph Ellison, a feedback screen or a tree with birds.
The Kindle goes into Sleep mode automatically after 10 minutes of inactivity.