The usb2chadp usb 20 fast charging adapter transforms your computer usb host port into a charge only port enabling the adapter to charge your mobile devices ipadreg samsung tablet etc as an ac wall charger would and ultimately decreasing your charge times which makes it perfect for people on the move the usb charger adapter also includes a switch that allows you to shift between data sync mode and fast charge mode the led indicator on the adapter will change from red when in fast