This kit mainly includes three micro servo motors with 90 degrees.
The rotation angle of servo is controlled by regulating the duty cycle of the PWM (Pulse-Width Modulation) signal.
The standard cycle of the PWM signal is fixed at 20ms (50 Hz), and the pulse width is distributed between 1ms-1.5ms.
The pulse width corresponds to the rotation angle ( 0°～90°) of servo.
The servo has three interfaces, distinguished by brown, red and orange line (different brand may have different color). Brown line is for GND, red one for power 5V, orange one for signal terminal (PWM signal).