On the front is a HD camera, with the Fire HDX 8.9 adding a rear - facing 8 - megapixel counterpart with
electronic image stabilization, a wide - aperture 5P f2.2 lens, and an LED
flash, and while it has approximately 11 hours of battery life in mixed use, the Fire HDX automatically powers down the processor and unneeded extras when used for reading, shifting stored text to a dedicated low - power memory
unit and boosting battery life when reading to up to 17 hours.