NOTE: Three ports with USB design can connect the keyboard, mouse, card reader, and so on (can't connect hard disk).
One power USB port can connect original charger to supply power for flash disk, card reader, mouse, keyboard and so on.
Compatible with all Firesticks, tablets and cellphones with OTG function, such as Samsung Galaxy S3/S4/Tab 3,2 ,Note 10.1 and so on.
Share your U disk content while charging the phone; Micro-USB Power can charge your tablet and smart phone simultaneously.
Plug and play. It can greatly save your working space and you can easily take it to everywhere you want to go.