It does exactly it says it does, and the setup could not be simpler. If your mission is to put out the IDENTICAL screen image to two (2) screens, but, like most, your portable device has only the single HDMI port, this is a great solution. It is truly plug-n-play.
If you are seeking to EXTEND THE DESKTOP by having two (2) monitors, then this product is NOT the answer. You will only get the same image on the two screens if you use this. If you need to extend the desktop and have only one (1) HDMI port, what you need is a USB adapter (e.g., HDMI to USB, DVI to USB, etc.).
OREI HD-102 1x2 1 Port HDMI Powered Splitter Ver 1.3 Certified for Full HD 1080P & 3D Support (One Input To Two Outputs)