05-11-2025
06:35
- last edited on
05-12-2025
13:14
by
LizzyFitbit
05-11-2025
06:35
- last edited on
05-12-2025
13:14
by
LizzyFitbit
2018 smartwatch healthy watch.
Walking/heartbeat/sleep.
Basic watch was good for several months, I really liked it, but the green light doesn't turn on anymore!
Why is that? It's always fully charged.
Moderator Edit: Clarified subject
05-11-2025 09:46 - edited 05-11-2025 09:50
05-11-2025 09:46 - edited 05-11-2025 09:50
Hi @Nagyougalik and warm welcome to the forums.
I appreciate your message, and I'm sorry to hear that the green light doesn't turn on anymore.
Fitbit devices have optical heart rate sensors that use rapidly flashing green LEDs to detect changes in blood volume in the capillaries of your wrist. Light-sensitive photodiodes measure these changes, and your device calculates your heart rate in beats per minute (bpm). The infrared light is used to detect when the device is worn to improve the accuracy of your heart rate readings.
Turn on heart rate tracking
Heart rate tracking is turned on by default. If you’ve turned it off, here’s how to turn it back on:
On your device, open the Settings app.
Tap Heart Rate to turn the setting on.
Could you please confirm what is your device's name?