I have a bufang speed controller 1500 w with the screw on motor connector which I cut off and soldered the original plug from the Add Motor speed control. I fried the second one just like this trying to hook up the USB cord. I'm pretty sure I connected it and turn the battery on in the right order. The first one I fried was getting the horn hooked up!! So I looked at the Amazon site in the comments and the seller said this electronic speed control was not programmable. I'd really like to find preferably with buffet connectors a programmable speed control. I guess my question is is it true that bufang has a non-programmable speed control model ? I would like to try the USB thing again but I can't even find the original speed controllers I bought a year ago so I'm kind of afraid to reprogram it because I'll be out of fun transportation