I need a tracker to help me monitor my heart rate in real time. I would like to set my heart rate at low end to be 120, and high end 150.
If my heart rate is out of this zone, I like to get a vibration as warning. I don't need any other features.
does vivosmart 4 do this? If so how to set it up? This is to help with my zone 2 training. Draining battery is not a concern.
If vivosmart 4 cannot do this please recommend the cheapest version that does this. Thank you!