Long not all USB hubs comply with the specifications that you gem. Should comply with description. This, however, stick to it and is doing in terms of power supply a stable impression. I'm using this hub for the power supply! my Raspberry Pi and the connection of two external USB disks. So my Rasp eg no power supply needs in addition and I can save the power loss of a power supply, and of course the purchase price. The stroke itself is timeless simple, well-made. The price rises certainly on many another hub. But here you pay for the security that one "active" also gets the feature and may charge.