This USB Host adapter allows you to connect a USB memory stick, an USB 2.0 memory card reader, or a keyboard to your Tablet & Cell Phone. (some standard USB 2.0 devices need to connect the extral usb Cable if they consume too much power) PC-free back Up of videos and photos fromTablet & Cell Phoneto an external memory stick in a convenient way. Connect to a keyboard for easier control of yourTablet & Cell Phone. The extral USB Cable is the for USB Device(Like usb hard Disk, flash Disk), Can not theTablet & Cell Phone