Sorry to bump this but my VS4 does this too. When they are blinking rapidly, from your post it means its in standby/watch mode. Does this mean it is still monitoring HR in real time? Because on my app even when LEDs are blinking, the app shows HR changing slighty so I am guessing it is still tracking even when in standby mode? Thanks!
Tried it (now) and the LED stops flashing, maybe it's fixed with and an update.
The LEDs are flashing if the watch recognises movement. If it doesn't notice any movement for a (given period of) time, the LEDs turn off.
This is why they are flashingwhen you lift the watch from a surface (off of your wrist).
It is to consume less battery.
Hi Enrico. I turned off heart rate mode and mine still flash continously green.