FeaturesThis light therapy belt combines red LED with infrared ray to deliver heat energy to deep skin layer of 635nm and 850nm to accelerate cell and collagen regeneration, stimulate acupuncture points, accelerate cell metabolism and blood circulation, so as to reduce fat and relieve muscle and joint pain. -- Anytime & Anywhere: LED belt has portable and wearable at the same time. You can enjoy it anytime, anywhere by connecting to a power bank or charging terminal. Enjoy near-infrared therapy at home, at work, in the car, or while hiking, doing yoga, jogging, and doing various activities. -- Weight loss and Pain Relief: Affordable red infrared light therapy device can effectively relieve pain without causing harmful side effects. -- Relieve Joint and Muscle Pain: red light therapy device is suitable for back, neck, shoulders, arms, knees, hands,feet. At the same time, it can also help for muscle fatigue and soreness. Specificitaions: Operating temperature :0 C to+27 C (32 F to 80 F) Relative humidity: 85% Storage temperature range: - 30 C to+55 C (- 22 F to+130 F) Wavelength: Far infrared light 850 nm, red light 630 nm Power supply: 12V 2.5A (250 lamps) Size: 70 * 26cm Number of lamp beads: 250 (125 at 630nm+125 at 850nm)