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Green light blinking while on activity with external HR Strap

Hello,

I am using External HR Strap for my activites and I've noticed that when I am on activity, it says External HR Sensor is connected, but I can see that the green light is blinking all the time. I thought that the wrist sensor should turn off when strap is connected? What is, if not HR, being measured then ? As far as I know, for HR, the sensor should stay green lit(not blinking), but anyway, I am using External HR sensor.

Thank you!