"The team has packed an incredible amount of technology and innovation into the new Fire HDX...and it's still startlingly light," Amazon founder and chief executive Jeff Bezos said in a release.

Bezos boasted that Fire HDX combines "best-in-class hardware with exclusive features and services."

The tablet started at USD 379 and could be ordered at Amazon.com, with shipping of each of its freshly-unveiled new devices slated to begin in October.

Amazon also introduced new Fire HD tablets with 6- or 7-inch screens with starting prices of USD 99 and USD 139 respectively.

"Fire HD is the most powerful tablet under USD 100,"  Bezos said, noting that it is synched to the vast trove of digital content and services at Amazon.com.

The Seattle-based Internet titan also unveiled a version of the high-definition Fire tablet designed especially for children with perks such as a year of unlimited access to thousands of book, films, and games as well as free replacement if broken within two years of purchase.

A new Kindle Voyage billed as the thinnest, most advanced version to date of the popular e-reader was priced at USD 199, and an improved basic Kindle model was introduced with a USD 79 price.

"Our mission with Kindle is to make the device disappear, so you can lose yourself in the author's world," Bezos said.

"Kindle Voyage is crafted from the ground up for readers," he said.

The new offerings from Amazon.com came on the same day of reports that Apple is planning to showcase new iPads at an event in October.