M-TRONICS VIPER TRUCK ESCThe Viper Truck is a Brushed speed controller designed specifically for use in RC trucks. The Truck has a 15 turn motor limit or dual 27 turn 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 15 or if you want to fit two motors to your model (dual), you can use any two, DC Brushed 540 size motor, as long as the number of turns on each motor are