When charging, the Mi Band can use the 5V 500mA USB interface of the computer, or use the voltage of 5V and the current of the mobile phone charger in 1A or 2A to charge (the wristband limits and protects the current input by itself).
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Any brand of mobile phone can use the Mi Band, but the system version must be above Android 4.3, and support Bluetooth 4.0. If the system version is Android 4.3, you can use some of the functions of the Xiaomi Band, and Android 4.4 and above perfectly support the Xiaomi Band.