Xiaomi’s Mi Band 2 keeps the iconic design, but replaces the three LED lights with a 0.42 OLED display. There is also a touch-sensitive key below the tiny screen, which helps you switch between the different notification panes.
Other notable upgrades are the bigger battery ( 70mAh) , improved HR sensor, better motion tracking sensor, and enhanced Bluetooth connectivity. The strap also got a refreshed design.