Featuring the industry’s largest protrusion of knead balls and the industry’s first double sensor. To relieve severe stiffness specific to people of the present age, the largest protrusion of knead balls in the industry (approximately 12.5 cm) target the deeper layers of muscles. In addition, two sensors are used to simultaneously detect the shape of the spine and the position of the shoulders so as to optimize the depth and points of massage. Two knead balls drive up/down, left/right, and front/back, and the duration is also closely controlled. The mecha unit uses innovative power and techniques to capture deep layers of stiffness more deeply and delicately.