JU27 USB 3.0 3 PORT HUB + CARD READERLED indicator for power statusMultiple USB 3.1 interface support plug and play. hot swap, easy to use and carry.Support over current and under current protection.Support USB 3.13.0 super speed (5Gbps) transmission, downward compatible USB2.0Driver free, support windows XP, windows 7, 8 and Mac OS, Linux.Independent supply provides power supply to connect devices.The devices connected to the 4-Port USB 3.0 Hub must not exceed a combined current of 5 volts 900 mAh.The power supply is not included.USB 3.0 interface.High speed data transfer up tp 5 Gbps.Fast transfer rate for reliable copydownloadbackup.Fast transfer rate for reliable copydownloadbackup.