Xiaomi's $13 fitness band can also unlock your phone

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Xiaomi's $13 fitness band can also unlock your phone

The "one more thing" at the Xiaomi Mi 4 launch was the Mi Band, the Chinese company's first smart wearable, and it's obviously aggressively priced: Just CN¥79 or about $13! Like many of its competitors, the Mi Band tracks your movement (walking or running) plus sleeping pattern, and you can also use it as a smart vibrating alarm to wake up feeling better. Interestingly, a single charge on this waterproof device will last up to 30 days, which easily beats its competitors that tend to last for a week or less. Better yet, the band doubles as a security token that automatically unlocks your phone -- likely just Xiaomi's for now -- when within proximity. There's no word on availability just yet, but as always, Xiaomi should be debuting this in China where it'll instantly sell out.

Gallery: Xiaomi Mi Band | 4 Photos

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