Side micro USB for tablet or smarphone and female USB side to receive a USB key simply. No drivers or software required; it works the first coup.Donc handy for viewing images or videos or books etc.Bien designed, careful anyway to handle all USB adapter + with caution as this is a door overhang that could endomager the micro USB socket of the tablet or smartphone. Product delivered quickly and very great interest to the extent that the keys with USB Micro USB plug is still rare.