Digital servos can be programmed for direction of rotation, center and end points, failsafe option, speed, and dead bandwidth adjustment. This is great for matching sets of servos for deadband width, center and end points in giant scale aircraft applications, and for reversing a digital servo when two are used on a "Y" harness. If you do not want to deal with the added complication of programming, no worries! Hitec digital servos will perform like standard servos out of the box. It is not required to program them before use.