VIPER Auto Sport Tuned 20 ESCThe Autosport20 has a 20 turn sport tuned motor limit, what this means is that you can use any, DC brushed 540 size motor, as long as the number of turns on that motor are equal to or higher than 20. It is a perfect entry level speed controller for anybody wanting to upgrade their old speed controller for a no nonsense 20 turn limit reversible electronic speed control with the added feature of no difficult setting up! The Autosport20 uses the new