USB Charger Cradle Mount Dock Docking Station SD Card Reader for Samsung Galaxy S2 S3 S4 I9300 I9500 Note 2 N7100 Black High Speed and 2 ports USB 2.0 Hub;High Speed data transfer;No external power required; Simply remove your phone case and place it on the dock, connects the dock to the PC with an USB cable, your phone then will sync and charge at the same time Compatible Devices: Samsung Galaxy S2 S3 S4(9100,9300,9500),Samsung Galaxy Note 2 N7100, and any other devices with micro usb; When the Mini USB port connected to your computer, this section can be a common computer base HUB and card reader Note: You're kindly reminded that the micro USB port should be kept connecting to the PC (not to the wall charger) with an USB cable for power supply