3 Levels Heating Red Light Belt: Adjustable red light heating for different needs. Low: 104-122/40-50 , Middle: 123-140/51-60 , High:141-150/61-65 . You can choose the most comfortable temperature for body, the display only show the temp in , no impact on use, please consider if you can accept this before get it. Decompression Back belt: Ergonomic design with multiple air columns, provide the right traction and strong support to stress lumbar problem. Relax low back discomfort, relief spinal issue. 3 Modes Vibration Massage:Vibratory massage combined with red light heat for better relaxation, feelings of use are vary from person, you can choose the most comfortable mode, and simultaneous or separate use of red light heat and vibration, you can also do neither and simply use the inflatable back brace. Cordless Heated Back Brace: Built 5000mAh battery, convenient to use at anywhere. 3 hours charging time for 50-110 min using. We recommend 20-30 min a wearing time. Please stop using it if you feel uncomfortable. Fit For 29 To 49 Inches Waist: Comes with extension strap to adjust the length in need, this red light belt support waist circumferences from 29in to 49in, please confirm whether you can wear it before purchasing.