HPI Racing E-Savage controller has ESC with reverse speed. Automatic setup. Always utilize the GT550 Motor. Using other motors may harm the speed controller. The GT Speed Controller does not work correctly with the Futaba high reaction system.Replacement GT SpeedControllers for the E-Savage are now available through HPI Racing. The GT ESC bolts right into the E-Savage and is developed for twin batteries(14.4 volts!)and twin motors. It comes total with all the basic plugs and switches for easy installation. A purple anodized heat sink keeps the electronic devices cool, and an integrated Fail Safe protects the ESC from damage. Set-up is easy with the FASF (Completely Automatic Setup Function ), simply power it up and begin driving! Completely proportional throttle and brake assure that you have accurate control at all time, and the integrated reverse feature lets you revoke circumstances where other trucks would get stuck!"