The new version of Mi band - Mi band 2.The band has a heart rate sensor, OLED display, ideal alert, and few more extra features.The app is same and when u’ll pair ur new mi band 2 with the app, all the new features will come.U can now add many alarms as in the earlier version only 3 were allowed.The band vibration is just awesome.If u r wearing it u’ll be notified about every call , messages and app notifications.But, for that ur mobile bluetooth should be on and the mob should be in range to the band’s bluetooth.Overall the band is very much better.The battery back-up has reduced to now around 15-20 days but with me its been 12 days and the battery is 56? .So I hope it would work pretty good.The heart rate is accurate.If u don’t move ur wrist and be still it will always give the correct reading.The band looks attractive and if u own the older version of Mi band U will definitiely like this one.If u wanna ask any other questions pls feel free.Thank u soo much.Cheers!