The amount of light absorbed at a given time determines your heart rate.
What are the green flashing lights on my fitbit alta hr.
The light is the heart rate sensor.
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The flickering green light is what is used to measure your heart rate.
If this isn t the case you can also try changing the setting to off sync your tracker then change it back to auto additionally to restarting it.
Plug the fitbit into your computer and press the little black button on the lead computer end three times within four seconds and it will vibrate and restart do this 3 times and it should be flashing green again vicki vicki bugden rsli mvlp nrcpd.
It s on the charger and i ve installed the updates hit the reset button restarted my phone logged out of the app reset my bluetooth and most recently disconnected the device from my fitbit account.
Optical sensors are here to stay but the exact make up of those optical sensors whether they re from fitbit apple or garmin are up for debate.
Go to the app account alta hr and see what the hr is set on.
My alta hr has been flashing all of the icons for hours now.
Let us know how you go.
Press the button on the charging cable three times within eight seconds.
It s recommended to wear it tightly but not too tight but if you want to turn it off you can go to fitbit your watch top right heart rate and set it to off on auto tracks if you are wearing the watch.
Like usaf larry said the green lights are part of the heart rate sensor and will be on all the time if you have the on setting for the hr.
Most of the wearables you can get your hands on use.
It is still on at night because it will track your sleep better.
The light flashes on the blood pulsing under your skin and a light sensitive photodiode measures the amount of green light absorbed.
Clip your alta hr to the charging cable and make sure the cable is plugged into a usb port on your computer.
It might have somehow switched from auto to on.
You may notice the green led light flashing at random times or while you re not wearing the device.