- The drive system has a DC motor with a diameter of 6 mm and an 0.5 modules 8 tooth pinion gear attached.

- A 42 mm super gear is attached so that it is sandwiched by 2 3 mm nuts on a 2 mm screw rod.
- Two 3 mm nuts are attached to the slide link printed with the 3D printer, and when the shaft rotates it will slide on the shaft.
- The screw pitch of the 2 mm shaft is 0.4 mm, and when the shaft rotates 32 times, the link travels about 12 mm.
- Link mechanism has a 2 x 2 mm magnet attached.
- On the other side of the super gear of the shaft, a 3D printed disk is mounted in the same way with a 3 mm nut, but two 2 mm x 2 mm magnets are mounted on that disk.

- The control CPU is ATTINY84, with three magnetic sensors, an H bridge type motor driver and a Piezo speaker.
- The two magnetic sensors detect the both ends of the travel.  

- The servo interface sends a 10-bit data via serial Interface. From the host, you can specify the position, the power of the motor, the frequency of piezo speaker sound.