Quantity   Component name
1 × Raspberry Pi 3 Small linux computer used to run a pico engine.
1 × Rotary encoder Rotation encoder used to queue events in the pico engine.
1 × 9g servo Actuator used to open Jack's door.
1 × Speaker Small battery powered speaker, used to play synthesized MIDI notes.
1 × Lithium battery expansion board Battery pack used to power Raspberry Pi 3.
2 × 3 AAA battery case Battery case used to power the servo.
1 × Jack-in-the-box Children's music box with a jester that pops out at the end of a song.