As you can read here already often, can the stroke really "only" use of two devices, and not for three. In addition, the problem came to me that my camera was not controllable by this stroke. At the second port should Run FireWire hard drive. If none of that works, and that's why I returned the item. Want but here again it explicitly point out that this is only my opinion here. He certainly is quite usable for other users, for me not.