K3 Intelligent Wireless Neck Massager The K3 Intelligent 4 Point Fit Neck Massager adjusts with the human body's cervical physiological curvature. It uses low-frequency pulse, infrared light heating, U-shaped ergonomic design, and 3D intelligent bonding technology to form a composite energy field. It fits the neck in all directions and is extremely comfortable to wear. It provides a healthy and comfortable therapy for the cervical spine by maintaining the correct physiological position. Its ligh