This adapter by Delock is compatible to various Android smartphones and can be connected to your smartphone through the USB Micro-B interface. Thus you can read and write different memory cards like e.g. SD / SDHC / microSD through both slots. Furthermore you can connect a HDD or a USB stick to the USB-A port. The USB Micro-B port provides additional voltage when connecting a TV to the HDMI port, therefore you have to use your existing power supply. Just plug the included cable to the adapter and to a free USB-A port. For the HDMI function on Samsung Galaxy S3 or S4 with 11 pin MHL port you have to use the additional adapter.