ZKTeco C4FS Serie Guía Rápida página 11

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Recharging the Battery
In addition to the power supply from solar panel, you can also use an additional
power adapter to charge the camera.
Use a universal power adapter with a DC 5V/1A output to charge the
device. When the device is charging, the red LED will illuminate. In the App,
you can see how much battery life is left.
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