Goobay 42973 User Manual - page 13
Manual is about: PowerBank 5200 mAh LIPOL (iPad)
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14 Quick Start Guide:
1. Switching on/off and Battery status:
Press ON/OFF button for around 3 seconds in each case
until the battery status shines/expires.
2. Start/stop charging:
The charging process of PowerBank / USB device starts
automatically after switching it on, depending on which port
is connected (input/output). Interrupt and continue charging
by pressing one short time.