The original Kindle Fire, released by Amazon in 2011, features a 7-inch IPS panel with a 1024 x 600 pixel resolution and 8 gigabytes of internal storage. The internal battery was capable of providing eight hours of reading or seven and a half hours of continuous video playback.
The original Kindle Fire represents Amazon's first foray into multimedia tablet territory, facing stiff competition at the time from Apple's iPad 2 and an ever-growing variety of Android tablets. Amazon marginally improved the Kindle Fire's technical specifications in the following year with a 40 percent faster processor, nine-hour battery life and twice the internal storage capacity.
The largest improvement to the Kindle line-up arrived in 2013 with the release of the Kindle Fire HD, which added a 7-inch high-definition IPS touch screen with a 1280 x 800 pixel resolution, the option for 8 or 16 gigabytes of internal storage, a 10-hour battery life, and a 1.5-gigahertz dual core CPU.
As of 2015, the most recent iteration of Amazon's tablet is the Kindle Fire HDX, which is available in a 6 or 8.9-inch form factor. These tablets feature high-definition IPS displays, quad-core processors, improved battery life, and up to 64 gigabytes of internal storage for the larger model and 16 gigabytes of storage for the smaller model.