Sony Corp <6758.T> on Tuesday launched its first wireless electronic reader, a move to challenge Inc's recent dominance of the growing digital book market.

The Daily Edition, priced at $399, features a 7-inch touch screen and will be available to consumers in December. AT&T will be the carrier for the new wireless device.

After a year of headlines dominated by Amazon's Kindle electronic book reader, Sony has taken the offensive this summer. Earlier this month, the company launched two new lower-priced readers for $199 and $299. Amazon's Kindle devices cost $299 and $489 for a larger-screen version geared toward newspaper viewing.

The company said in August that it would convert its digital book store, which includes over 1 million titles, to EPUB, a publishing standard that allows users to read their books on multiple devices.

That move likely will attract consumers who do not want to be limited by Amazon's proprietary system. Its titles can be viewed only on a Kindle or by using Amazon software on an Apple Inc iPhone or iPod Touch.

Sony released its reader in 2006, but Amazon's Kindle, which launched in 2007, has gotten much more attention.

(Reporting by Alexandria Sage and Franklin Paul. Editing by Robert MacMillan)