Like other e-ink devices, the X4 Pro has pretty great battery life — I’ve been using my device most days for about three weeks, and I’m only down to 60% battery. Naturally, the light means that the battery will dwindle a bit more quickly than its predecessors, but I barely notice the difference. What people will notice, however, is that the X4 Pro charges using a magnetic pogo charger, while the X4 had a USB-C. This isn’t a big deal to me, since the device has to charge so infrequently, but if you’re really passionate about the universality of USB-C, this could be a dealbreaker.
The X4 Pro also comes with updated software, which is a big upgrade from the previous models, but the device also will continue to allow users to load open source code. The process of uploading content via Wi-Fi and Bluetooth is doable, though it remains a bit clunky — I find it easier to just remove the micro SD card and use the provided micro SD to USB adapter to add files from my computer.
If you’re used to more mainstream e-readers, it’s also worth mentioning that you’re probably not going to be able to read library e-books on the X4 Pro. Xteink can’t integrate directly with apps like Libby, and even if you borrow an e-book from the library, you won’t be able to add it to your X4 Pro (libraries use protected versions of .epub files that you can’t copy). But if you buy an .epub file from a publisher, you’ll be able to add it to your Xteink device without a problem. (Just don’t try buying books on Amazon. It’s a walled garden, so you can only read Amazon ebooks on Amazon devices, even though you literally purchased the book! Booooo!)
The Xteink X4 Pro costs $99, and at launch, it’s only available on Xteink’s website.
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