3D Compression Therapy: Simulates kneading hand massage with rhythmic air pressure on both sides of the knee or calf to reduce stiffness and deep-seated cramping. Vibration Massage: Adjustable intensity with long-wave frequencies stimulates muscles and promotes relaxation. Heat Therapy: Gentle, penetrating warmth targets upper or lower knees, loosening tissues and boosting circulation. LCD Display Window: Offers effortless fingertip control with 20-minute auto shut-off. Compression massage, vibration massage, and heat treatment can work alone or simultaneously. Versatile design of foldable heating pad adapts for upper or lower knee heat treatment. Ergonomic design and reversible use for dual-knee or calf massage. Breathable fabric ensures cozy comfort for all-season use.