... Classic; Attach power adaptor or computer using the accompanying micro USB cable.6. USB port: Plug the connection kit into the dock connector ... to iPad through USB flash disk. Besides, the USB port supports external PC keyboard input. More detail information about all 6 in 1 ... feel free to contact us. all 6 in 1 card reader,sd card port,micro sd card port,3.5m DC port,USB port,mini USB port,HDMI PORT