It is in a category of its own. There is no equivalent product from any other company. That is why its construction should be of HIGH QUALITY. However, it is not..... On its first use, when plugging in an electric tool (saw), the socket "burned out," despite having a fuse for such cases. Socket 2 worked properly (I checked it). Therefore, it passed current through the fuse that should have "destroyed" it, NOT the socket. This means... INADEQUATE SAFETY!