I have bought an bluetooth heart rate monitor belt to use with my Android LG G3. There are many apps that can use that belt to record heart rate while I am running. Unfortunately none of them (I have tried Runtastic,Runkeeper,Endomondo,MapMyRun and so on) does a simple thing: play a sound when I cross a specific heart rate zone. This is a feature that a sport watch can do but not Android. Does exist an app with that feature?