Devices with Android 4.4, iOS 7.0 or above with Bluetooth® 4.0 support
Devices with Android 4.4 and above, such as Mi 3, Mi 4, Mi 4i, Mi 5, Mi Max, Redmi Note 4G, Redmi Note Prime,
Redmi 1S, Redmi 2, Redmi 2 Prime, Redmi Note 3, Redmi 3S, Redmi 3S Prime, Redmi 3S+
Devices with iOS 7.0 and above, such as iPhone models 4s and later.
Note: Mi Band's phone unlocking feature requires smartphones with MIUI or Android 5.0 and above.