This is an ultra-compact jigging machine that doesn't take up much space. It has a simple, durable construction with only a PWM speed controller. The rod holder and clamp use new parts from the "NAKAZIMA Universal Rod Holder." For a demonstration of how it works, please search "シャクリ機" (jigging machine) on YouTube. The battery is 12V only. Please connect the positive and negative terminals correctly. Please note that this is handmade by an amateur, so it has imperfections. Please refrain from purchasing if you are overly concerned about this.