Tripp Lite AG-879F Series Owner's Manual page 16

Operation
7. Switch the inverter's ON/OFF switch to the ON (I) position.
8. Turn the device on.
9. To disconnect, reverse the above procedure.
USB Charging Operation
The USB charging ports are always ON. Connect your device to these
ports for USB charging up to 2.0A (shared). Remove your devices from
the USB ports once they have finished charging in order to reduce
battery drain or start the vehicle.
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