The Kindle Fire HDX is the third generation of Amazon's Kindle Fire line of tablet computers available in two models, 7 inch and 8.9 inch. Both the 7 inch and 8.9 inch models contain a Qualcomm Snapdragon 800 processor that has an Adreno 330 graphics processing unit. The models also have a 1.2 megapixel front camera that shoots 720p HD video. Both models use Fire OS 3 which is a proprietary fork of Android 4.2.2. It features "Mayday", a button for free tech support available any time, "Silk", a cloud-accelerated browser, the Amazon Appstore for games and apps and Amazon.com services for media content purchases.