In announcing the Oasis on Wednesday, Amazon said its ultimate goal is to make the hardware eventually "disappear," delivering the simplest possible experience for readers. In the retailer's words, the Oasis is "another step toward this mission," weighing in at 4.6 ounces and measuring 3.4 millimeters at its thinnest point. In order to achieve this svelte design, Amazon trimmed battery life on the Kindle itself, and developed a new dual-battery design. The Kindle Oasis ships with an included charging cover that delivers "months" of uptime, according to Amazon.