My Heart Rate Monitor does this
It is a Coospo HW9. It has a 5 colour LED that shows which of 5 HR zones you are in.
The zones are configurable through an app.
You can wear it so that the LED is visible, or not.
My Heart Rate Monitor does this
It is a Coospo HW9. It has a 5 colour LED that shows which of 5 HR zones you are in.
The zones are configurable through an app.
You can wear it so that the LED is visible, or not.