Hello Tiger93k. The ET-M2170 uses approximately 12.0 W of power consumption when printing. It is not considered portable due to its size and various functions. For a mobile printer, we recommend looking at the WF-110, as it is a more compact printer with a single function and can be charged via a USB connection. For more details on the printer's power usage, please visit our official Epson Support page and review the "Electrical Specifications" section in the User's Guide. Regards, Kevin - The Epson Team.