The JX Servo PDI-5521MG is a powerful digital servo with metal gears. The servo operates in 360° continuous rotation mode. It stops when the PWM signal is within the range of 1470–1530 µs. In the range of 500–1470 µs, it rotates clockwise; in the range of 1530–2500 µs, it rotates counterclockwise. The rotation speed is 53–65 RPM depending on the input voltage.