Xiaomi Mi Band 1S goes official, monitors your heart rate and sleep quality for just
 

Xiaomi today announced the successor to its hugely popular Mi Band wearable, the Mi Band 1S. The Mi Band 1S can measure your heart-rate, monitor the quality of your sleep, track the number of calories you’ve burnt, and count the number of steps you take. There is no display on the wearable, so all the...

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