NGTeco NG-D500 Serie Guia De Inicio Rapido página 10

4. Use the provided wrench to lock the bottom of the doorbell by
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the screws.
Recharging the Battery
Charge the doorbell with universal power adapter that deliver DC
5V/1A output. The red LED will light up when the device is
charging. You could check the remaining battery level in the App.
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