The cable does exactly what is described: About OTG on the smartphone / tablet connected USB devices supplied with power. I conclude with the cable a 3.5 inch HD on my tablet to go to secure photos. A battery pack serves as Stropmversorgung for HD. Goes also with an AC adapter or charger. For those who are trying to load your smartphone / tablet: No, you can not. Szeht also in the description:
However, it is not possible to load the Android device, while a USB OTG device is connected.