The M8s appears almost identical to the M8, with the same 5-inch 1080p display and all-metal build, but it uses an eight-core Qualcomm Snapdragon 615 processor and swaps the 4-megapixel "UltraPixel" camera out for a more conventional 13-megapixel sensor.
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Unlike the M9, the M8s retains the secondary lens that enables focusing effects. The battery is 2840mAh, a slight bump on the M8's 2600mAh cell; there's 2GB of RAM; and the phone comes with 16GB of internal storage as standard alongside a microSD slot.
It's slightly thicker than the original M8, coming in at 9.55mm thick versus the prior 9.4mm; both phones, however, weigh the same 160g.
The M8s runs HTC's Sense 6.0 software atop Android 5.0 Lollipop, rather than the Sense Seven version introduced with the M9.
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The M8s will be available in silver, gold, and gunmetal gray, and for now at least the release will be limited to Europe. Exact regions and release dates haven't yet been made clear, but the phone will sell for £379.99 (Rs 25,600).
The original M8 sold for around £530 (Rs. 35,800) upon release, though it's worth noting you can now pick it up for less than the M8s today.