Broadcast HR - low battery usage

vivoActive HR app to show and broadcast HR only I created this simple heart-rate app so I can use my Garmin edge on my bike ride while the watch (vivoActive HR) send over my HR so the edge (800/810/820/1000/etc) can show it and record it as part of my cycling ride. This app don't use GPS and is fairly "nice" in terms of battery usage. It is open source on github (Version 1): https://github.com/shprung/garminIQ_HRonly. Version 2 is the same code base but larger font size and a bit of layout updates.

version 2 - even larger font size for the time. layout improved to show battery percentage and running time at the bottom with more readable font.