Hi, it's good to see you visiting the community forums for the first time, @Mno46.
Thank you for the information provided about this inconvenience with the Charge 5.
The red light that you mentioned earlier corresponds to the SpO2 feature. Your Fitbit device measures your SpO2 levels while you sleep using red and infrared sensors on the back of the device. The sensors shine red and infrared light onto your skin and blood vessels, using the color of the light that bounces back to approximate how much oxygen is in your blood. You can find more information about this feature and how it works here.
Let me know if you were referring to this light or if you're referring to something different.
Davide | Italian and English Community Moderator, Fitbit
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