Edit June 20, 2020 Product works as advertised. Obviously I didn't understand what I bought and what it actually does compared to what the YouTube videos told me it should do. Doesn't work properly. This device only outputs input voltage. The terminals register 0 voltage until the button reaches the input voltage. Then nothing changes the further you turn it. Unfortunately, it took me a while to put the pieces together for my Power Wheels battery rebuild project. I was going to hook it up today only to find out the rear window was closed yesterday. Aggravating!