Sony has launched a wireless¹ e-reader which allows users to download electronic books on the go.

索尼发布一款无线电子书阅读器，可以使用户随时下载电子书。

Amazon has so far dominated the e-book market

Analysts³ said Sony's Reader Daily Edition is a direct challenge to Amazon's best-selling Kindle⁴ 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 compensate⁵ for（弥补，赔偿） its biggest weakness: its lacklustre（无光泽的，呆滞的） eBookstore, which pales in comparison with Amazon.com," said Sarah Rotman Epps, an analyst² with Forrester Research in her blog.

Lending service

Amazon has so far dominated the e-reader market with its wireless Kindle devices.

In May of this year, the firm unveiled a new version of the gadget⁶（小工具，小玩意） aimed at reading newspapers, magazines and documents.

The Kindle DX packed a screen that was double the size of previous models.

It offer 46 newspapers, including The New York Times, The Wall Street Journal and USA Today.

However, it was criticised for its high price of $489 (£340).

Ms Rotman Epps said that Sony's new device - it's third so far - "makes the Kindle look like an oversized calculator."

Unlike, the Kindle, the Sony device features a 7-inch (17.8cm)touchscreen interface⁷ which can be used to read books in portrait or landscape form.

The Japanese firm has also signed a deal with US network operator AT&T to allow users to download books wirelessly⁸.

Sony also unveiled an application which allows users to download e-books from their local libraries.

"At the end of the library's lending period, e-books simply expire（期满，失效）, so there are never any late fees," Sony said.

Earlier this month the electronics giant also announced that it would stop using a proprietary⁹ standard（专用标准） for e-books in favour of the ePub open format¹⁰.

"Enabling consumers to access free eBooks via the public library network and Google's public domain¹¹ collection (which now tops 1 million volumes) - and letting consumers buy ePub books from other sources and read them on Sony's devices -greatly expands the value proposition of its devices," said Ms Rotman Epps.

Sony said it would announce deals with newspapers later in the year.

The device will be available in the US from December.