9 grams of rudder machines: External dimension: 22.5*12*26.5(mm); Weight: 9 grams; Working voltage: 4.8V; Stop up and transfer to the torsion: 1.2kg*cm; Pace: 0.12 second /60 degree; Modulate (PWM) the signal in pulse width that the control signal is 20ms for cycle, among them the pulse width is from 0.5ms-2.5ms, the position to correspond the steering wheel is 0-180 degrees