DO NOT be deceived by copies of HobbyWing ESC's. I bought one on Ebay that sure looked like the real thing, but when I got it, it did not say HobbyWing on it and it did not have documentation to go with it - it was a copy or maybe a rejected Quickrun. Going by the ad, it's not easy to tell if it's the real thing or not. Why be concerned? It burned up in short order!