Xiaomi Mi Band The wearable is powered by a 135 mAh battery which is supposed to provide a battery life of around 20 days on a singlecharge. It takes about 2 hours to chargeThere is also a 24×7 active heart-rate tracker on the underside. A new UI makes its debut on the Mi Band 4 which is mucmore responsive and intuitive. It stays connected to your phone over Bluetooth 5.0.

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