This can happen when the charge of the light source is completely drained out.To charge, note that the device has 2 different charging ports.
1. To charge the EVA phone
2. To charge the LED light source.
You can watch the below video to know about it.
Note : The light source will not work while charging, that is, when the source is plugged-in. You can charge it for sometime and then turn-off the plug to use.
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