... turn on, the charger begins to charge.4. After charging, keep pressing the button for 3 seconds ... the first time using it.3. Before charging the electric device, please confirm the voltage ... current and short circuit,roundly ensure safe use.4.CE,FCC,RoHS certificate,reliably,quality assurance. ... current and short circuit,roundly ensure safe use.4.CE,FCC,RoHS certificate,reliably,quality assurance. ...