Pure-play e-tailer Amazon has unveiled its latest two additions to its Kindle family as it seeks to maintain its status as the world‘s most popular e-book provider.

The Kindle Fire HD, a seven inch tablet will be priced at £159 and also features Wi-Fi, exclusive Dolby audio and 16 GB of storage. With 11 hours of battery life, the tablet also has a Skype application which utilises its HD functionality while offering dual Wi-Fi antennas to speed up the downloading process.

An 8.9 inch digital display offers pictures in 254 pixels per inch and the next generation Kindle also uses the X-Ray feature first introduced last year with the Kindle Touch.

Amazon has also launched the All-New Kindle Fire for £69, featuring improved fonts, 15 per cent faster page turns and weighing 170 grams which also benefits from longer battery life.

Tablets are becoming an increasingly vital tool within the retail sector as Amazon‘s fierce competitor Apple continues to dominate sales, while e-books are also growing in popularity.

Earlier this week, grocer Tesco announced that it has acquired the Mobcast e-book platform provider from author and founder Andy McNab as it extends its reach in the flourishing digital market.

We‘re taking on the most popular price point for a tablet, $499, but doubling the storage and incredibly, adding ultra-fast 4G LTE wireless,” said Jeff Bezos, Amazon.com Founder and CEO.

“Kindle Fire HD is not only 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 high-end tablet anywhere, at any price.”