The Mi Band 4 is a substantial upgrade over its predecessor as it features a much better 2.5D AMOLED display and support for NFC. The band is being touted to last around 20 days on a single charge. This, however, is yet to be tested.
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Former National Defence Academy Cadet, Mukul Sharma is an Android Lover. He makes Android reviews on Android Updated. You can find him at Android Updated or at Stuff Listings.