I specifically chose this cable for my Echo (4th Gen) which I just bought from BB. As you can see, this extension does NOT fit. this is way too small. I'm assuming this extension is for the Echo Dot. The cable on the left is an extension supplied to me by Revain. The cable on the right is the original Echo PSU purchased from BB. This extension cable is not compatible with new Echo devices (4th generation) as described in the product details.