First I must state that if you have not yet installed the drivers, the scanner will very likely not work so if you're having that problem where you can't get your system to recognize the scanner please make sure you install the correct drivers from the Epson website.
This scanner connects and is powered solely by a Micro USB cable. The scanner itself is 5 volts 0.5 Amps (500mA), so it should work with any computer featuring at least a USB 2.0 port. USB 1.0 only outputs 0.1 Amps (100mA), so they will not work with USB 1.0 ports.
USB 3.0, 3.1 and USB-C typically provide 0.9Amps 900mA, so they will have ample power to supply the scanner. A higher amp rating will not harm your electronics, and all USB ports are 5 volts so you don't need to worry about over voltage.
This scanner is lightweight and could be viewed as portable given that it only uses a cable and does not need to carry around any bulky power supplies or additional cables. It's slim and easily fits in a laptop bag or backpack making it handy when wanting to copy materials at a library! Of course you could just use adobe's scanner app on your mobile device to do similar, but I find that can be tricky sometimes with certain lighting situations.
This is a great value for its price but lacks some of the features you'll find on the more expensive models.
The hinges on the scanner only raise up about as high as my pinky finger is thick, so not great for scanning books. The scanner also lacks any accessories or features for scanning film negatives, so keep that in mind if that's something you're wanting to do.