Berger & Schroter 31884 Instructions D'utilisation page 14

LED Indicator Light
The LED light indicates in which mode the solar panel is located.
1. The solar panel glass faces to light, the indicator light will be blue.
Now the panel is working.
2. When charging the solar panel via adapter or sunlight, the indicator
light will keep red.
3. After charging completed, the light goes out.
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