Home Tablets News Xteink launched the S4, its most capable e-reader yet, running Android for around $50. Xteink E-readers don’t have to be big, expensive, or locked into one ecosystem. Xteink, a Chinese brand quietly challenging the likes of Amazon and Kobo with compact devices, just announced its latest model. The Xteink S4 is a small, lightweight e-reader that runs Android and magnetically attaches to the back of your smartphone. It’s currently available for pre-order in China for around $50, with an international release expected in the coming months (via NotebookCheck ) What makes the Xteink S4 worth paying attention to? The biggest change with the S4 is the operating system. Earlier Xteink models like the X3 and X4 ran a proprietary OS, which limited what you could do with them. The S4 runs Android 11 , which is outdated, but it opens the door to a much wider range of reading apps. You could potentially install Kindle, Kobo, NOOK, Libby, Moon Reader, or FBReader.…