You can read this wire with an analog input such as those on an Arduino, to get the servo’s position. That information can be used in robotics to improve stability or even allow ‘recording’ of servo motion. The dimensions of this analog feedback motor are 11.57 x 22.75 x 29.45mm. The operating voltage for this motor ranges between 4.8 to 6V. Servo horns and associated hardware are also included in the package.