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The 7-inch Kindle Fire HD can switch automatically between 2.4GHz Wi-Fi networks and newer, less-crowded 5GHz networks, which Amazon says results in better range and less interference when downloading content.
Just as its Kindle e-reader spurred sales of e-books, Amazon is looking for its tablets to push up sales of apps, films and other downloadable content. The Fire devices plug into a marketplace of some 22 million e-books, movies, games, apps and music tracks.
"Not only does Kindle Fire HD feature the most advanced hardware, it's also a service. When combined with our enormous content ecosystem, unmatched cross-platform interoperability, and standard-setting customer service, we hope people will agree that Kindle Fire HD is the best 7" tablet available anywhere, at any price," said Jeff Bezos, Amazon CEO, in a statement.
The Kindle Fire HD weighs 395g, measures 10.3mm thick, and promises 11 hours of battery life. It will go on sale at £159. By comparison, the 7-inch Google Nexus tablet with 16GB of storage costs £199.