Sony has launched a wireless e-reader which allows users to download electronic books on the go.
Analysts said Sony's Reader Daily Edition is a direct challenge to Amazon's best-selling Kindle device.
The $399 (£250) touch-screen device is able to store up to 1,000 novels and can download books over a high-speed mobile network.
It also has an application that can be used to "borrow" books from local libraries for 21 days.
"By going open, Sony helps compensate for its biggest weakness: its lacklustre eBookstore, which pales in comparison with Amazon.com," said Sarah Rotman Epps, an analyst with Forrester Research in her blog.
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