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“This indicator appears when Parental Controls are enabled for your Kindle. Parental Controls let you restrict access to the Experimental Web Browser, Kindle Store, and content stored in the Cloud. Parents may use this feature to prevent children from purchasing content without their permission or from browsing any inappropriate online content.”
― Amazon, Kindle User's Guide

“To turn wireless off, from the Home screen tap the Menu button, select Settings, and enable Airplane Mode. Any periodical downloads or other pending updates that require a wireless connection will occur the next time you turn it back on. Turning on Airplane Mode disables both 3G and Wi-Fi connections.”
― Amazon, Kindle User's Guide

“If you bought your Kindle online using your Amazon account, it is already registered to you. To verify, tap the Home button and look for your Amazon user name in the upper left corner of the Home screen. If it says My Kindle or shows the name of a previous owner instead of your own Amazon account name, you'll need to register it. See Setting up your Kindle in this chapter for instructions on setting up and registering your device.”
― Amazon, Kindle User's Guide

“When you're ready to make a purchase, the Kindle Store securely uses your Amazon 1-Click payment method. After you order, the Amazon Whispernet service delivers the item directly to your Kindle via your wireless connection. Books are downloaded to your Kindle immediately, generally in less than 60 seconds. Newspapers, magazines, and blogs are sent to your device as soon as they're published—often even before they're available in print. If your Kindle is in Airplane Mode when a new issue of a periodical becomes available, the issue will be delivered automatically the next time you connect wirelessly.”
― Amazon, Kindle User's Guide