The Geekservo 9g 360° Servo (compatible with LEGO) is a kind of actuating motor composed with a DC motor and feedback control loop and generally controlled by PWM. There are mainly two types in the market: Limited rotation servo (angle control focus) and continuous rotation servo (speed control focus).
Has a working voltage of 3.3 to 6 V and a maximum torque of 500 g.cm.