AmazonBasics B00LRK8IV0 Manuel D'instructions page 5

Power button
When your power bank isn't charging a
device, pressing the power button turns
LEDs on indicate your power bank's charge
level.
When your power bank is charging a device,
pressing and holding the power button for 2
seconds turns your power bank on or off.
Power overload protection: Your power
bank has overload protection. To protect
your power bank and your connected
device in an overload situation, charging
stops and the LEDs turn off.
An overload can occur if the device you are
charging needs a higher power input than
your power bank can supply or if your
power bank is outputting more than 5V/2.4A
of power.
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