HTC's Butterfly series is an interesting one. While this particular range of models rarely makes its way outside of Asia, HTC often uses it as a testbed for new technology and features, and some of the highlights of these phones make it into the primary international lines on the next go-round. The latest version of the J Butterfly, which will launch exclusively on Japanese carrier KDDI next month, has some additions to the basic One design that might be worth watching.

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First of all, the body is designed differently, with what looks like high-quality polycarbonate (read: plastic, but nice plastic) instead of the metal we've become used to with the One family. That comes with two advantages: one, the screen design does away with the metal "double bezel" that's been standard since the original One, and two, the J Butterfly is water-resistant to IPX7 specifications. If you look closely, you can see that the dual front-facing speakers are still present.

The other big design change is the Duo camera. Where the One M8 uses a "4-ultrapixel sensor" and a standard 2MP sensor in a dual configuration, the J Butterfly swaps out the main sensor for a more conventional 13MP camera. Since the ultrapixel camera got lackluster results for the last two years running, that might be preferable for some customers. Then again, this might just be a cost-saving measure.

The rest of the phone shares its specs with the One M8 for the most part, including a 5-inch 1080p screen, a Snapdragon 801 processor, 2GB of RAM, and a 5-megapixel front-facing camera. The J Butterfly will also get its own Dot View case.

Source: KDDI via Engadget