difference between 2.1 a and 3.1 a usb charger

difference between 2.1 a and 3.1 a usb charger. There are some references to difference between 2.1 a and 3.1 a usb charger in this article. If you are looking for difference between 2.1 a and 3.1 a usb charger you've came to the right place. We have images about difference between 2.1 a and 3.1 a usb charger. You can check it out below.