I don’t know the device/app, but if it needs Android 4.4 it’s unfortunately not compatible with the Fairphone 1(U). 
PS: I added Mi Band to our list of Gear (not) compatible with the Fairphone
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I don’t know the device/app, but if it needs Android 4.4 it’s unfortunately not compatible with the Fairphone 1(U).
PS: I added Mi Band to our list of Gear (not) compatible with the Fairphone