I ordered 2 of these power adapters for two 7 port USB 3.0 hubs, expecting to have to modify them. My first surprise was they plugged into the hubs as is. Even the power polarity is correct. From the photo I could tell they were slim transformers and work well in all locations. 2 amps is enough power for all ports. These power adapters were perfect for my application. Then, to coat the cake with icing, the price is very reasonable. Everything about them is worth recommending, they work perfectly for me!