For less than $20 these work great. Then there is the narrow part, too long and too narrow. I just cant trust the feature, so I pause the music. No running in these babies I tried this model and am very happy with it. This unit you have to click the controller into place to charge it. I must say, this brand has never disappointed me. The biggest flaw was that the ankle straps were different lengths. It makes the shoes super lightweight, but Id sacrifice that for something a bit more sturdy, personally. When I opened the package there was a strong paint smell, like someone I just spray painted something.