USB mouse USB keyboard U disk camera card mobile phone storage card and card reader. U disk prompt too much power which indicates that the U disk cannot be used on Samsung tablet (has nothing to do with U disk capacity). Part of the mouse can not support. Disk format must be FAT32 does not support the NTFS. Mobile hard disk need ecternal power can suport. Built-in browser and ES browser can perfect support reading and writing. Before inserting into the/root/Storages/directory this directory is the directory of external card reader directory is empty. Directions for use: when the first time use please insert the OTG line tablet data interface restart the tablet; Each time before use USB devices need insert the USB devices into the OTG cable USB female and insert the OTG cable into the Tablet PC date interface. Midway replacement USB devices also need to remove the whole line and changing the USB device then insert the tablet data interface