Xiaomi mi band 1s

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Xiaomi’s incredibly successful Mi Band has a successor that’s much more intelligent yet still amazingly affordable. It’s called the Mi Band 1S, and it’s capable of tracking your sleep, has a built-in heart rate monitor, and costs just $21.

Xiaomi isn’t the only company offering affordable fitness trackers now, but you usually have to pay a premium for features like heart-rate monitoring. But not with the new Mi Band 1S, which will make its debut in China on Wednesday, November 11.

The Mi Band 1S does everything the original Mi Band did, and is IP67-certified for water-resistance, which means it can withstand up to 3 feet of water for as long as 30 minutes. It can also track your sleep, and monitor your heart rate — and it works with both Android and iOS.

The Mi Band 1S also vibrates to notify you of incoming alerts on your smartphone, and if you have a Xiaomi device, it’ll even unlock it for you. What’s more, users get all this for just $21 — with the original Mi Band being reduced to just $21 for those who don’t need a heart rate monitor.