3 Wavelengths: 460 nm, 660 nm, 850 nm Red Near-Infrared Therapy Belt for Yoga, Sports, Waist, Back, Shoulder, Arm Muscle Soreness, and Skin Care 360LEDs 3 Custom Light Modes Red Light（660nm +850nm） Blue Light（460nm +850nm） Purple Light（660nm+460nm+850nm) 360LEDs 4 intensities intensities – Temperature – Light Density Low：105.40°F/40.78°C     53.7 mw/cm² Medium 112.89°F/44.94°C    …