FITBIT CHARGE 6 Flickering
System Nominal
The flickering green light is the normal operation of the Photoplethysmography (PPG) sensor. It utilizes high-frequency light-emitting diodes (LEDs) to detect blood flow variations; this light only becomes visible as 'flickering' when the device is loose or off-wrist, allowing the light to escape the enclosure rather than being absorbed by the skin.
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