Avision AV210 - Manual (Page 13)

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2.3 Connecting the Cables
Make sure the power of scanner is off.
2.3.1 Connecting to Power
Plug the small end of the power adaptor into the power jack of your
scanner. Insert the other end to an appropriate power outlet.
2.3.2 Turning on the Power
After the power cable and the USB cable have all connected, press the
power switch to the “I” position to turn on the scanner. To turn off
the scanner, please press the power switch to the “O” position.
Power Cable
Power Switch