This is a wireless trackball mouse, "HUGE," featuring a large 52mm diameter ball, operated by the index and middle fingers, allowing for a wider range of pointer movement with a single action. It incorporates a low-resilience palm rest made of memory foam on the top surface of the main body, designed to reduce wrist strain during prolonged PC work. The sensor that detects the trackball's movement is equipped with a high-performance, gaming-grade optical sensor. By thoroughly analyzing the optimal trackball color and coating thickness for the optical sensor, and by redesigning the trackball from scratch, the ultimate pointer tracking performance has been achieved. It uses high-quality support balls, with 2.5mm diameter artificial rubies, carefully selected for their smooth surfaces. The ball operation can be changed using the "操球マウスアシスタント" (Sokyū Mouse Assistant).