HPI Racing E-Savage controller has ESC with reverse speed. Automatic setup. Always use the GT550 Motor. Using other motors may damage the speed controller. The GT Speed Controller does not work properly with the Futaba high response system.Replacement GT Speed Controllers for the E-Savage are now available through HPI Racing. The GT ESC bolts right into the E-Savage and is designed for twin batteries (14.4 volts!) and twin motors. It comes complete with all of the standard plugs and switches for easy installation. A purple anodized heat sink keeps the electronics cool, and a built-in Fail Safe protects the ESC from damage. Set-up is easy with the FASF (Fully Automatic Setup Function), just power it up and start driving! Fully proportional throttle and brake assure that you have precise control at all time, and the built-in reverse feature lets you back out of situations where other trucks would get stuck! "