Heart Monitor for Mi Band will periodically connect to your Mi Band 2 and take a heart rate reading which will then be saved to your fitness account for continuous heart rate tracking. The readings are also stored in a local database and can be exported to a CSV file for sharing. The frequency of the recordings can be changed in the app settings. This is not a replacement for the official Mi Fit app, and the Mi Fit app will be required to set up the initial pairing of the band to your phone i