This is the Novak XRS Reversible Sport ESC. Novak engineers have equipped the XRS with their latest achievement: a newer, more effective Smart Braking feature. The new Smart Braking II feature provides full braking power. With more controllable braking, R/C drivers now have a full range of braking without worrying about accidentally sending the vehicle into reverse. To engage reverse, the driver must return the throttle to the neutral position, then "shift" into reverse by returning the throttle toward the reverse/braking direction. This feature gives the driver more controlled take-offs in reverse, while being easier on the car's drive train. So whether you are just starting out in R/C, or are expertly maneuvering your vehicle down a challenging embankment, the XRS Reversible Sport Speed Control is a great choice at a great price.