Heat generation principle: The inner side of the pad is set with a self-heating cloth layer, made of far-infrared tourmaline self-heating fabric, which does not need to be heated by electricity in advance, just stick the self-heating waist belt on the skin. For the following people, please consult a doctor before use: 1. Those who are being treated by a doctor. 2. Those who are using medical electronic devices embedded in the body such as pacemakers. 3. People with malignant tumors, heart disease, or acute illness. 4. People with skin lesions, people with body temperature over 38 degrees (fever period). 5. Patients with high blood pressure caused by diabetes, etc. 6. Pregnant women, people with osteoporosis, people with vertebral fractures. Notes: 1. Please do not wear while sleeping; 2. For acute soft tissue injury, please use after 24 hours; 3. For patients admitted to hospital for back pain and inflammation of the lumbar region, consult a doctor before use; 4. Pregnant women and children should not be used; 5. If discomfort arises during the wearing process, stop using immediately and consult a professional doctor. 6. The heating pad is not washable.?Ideal Gift? Self-heating waist belt is suitable for women, the elderly, but also for office workers, long-distance drivers and other people. It can also help protect your waist when performing daily activities. ?Adjustable Straps?Size M: length: 41 inches/104.5cm, suitable for waist circumference 31.5-35.4 inches/80-90cm; Size XL: length: 44 inches/111.5cm, suitable for waist circumference 39.4-44 inches/100-112cm, please measure the waist circumference according to the position of the belly button and choose to buy the right size. Adjustable straps hold the lumbar support in place and the heat pad can be wrapped around, making it a good choice for your parents, friends or yourself. ?Heat Therapy?Using self-heating material, it helps to improve blood circulation, provide nutrition for joints and muscles, promote metabolism, unblock meridians and enhance immunity. Embedded with 20 magnets, it will provide magnetic energy by releg magnetic lines through the magnets to stimulate acupuncture points, promote blood circulation and keep your lumbar abdomen warm, it will provide support and protect your lumbar spine. ?Soft Material?Soft self-heating waist brace is made of high quality polyester and faux leather, the comfortable and soft material not only relieves pain and corrects posture, but also keeps you warm. Portable tourmaline lumbar support brace with high elasticity and easy to put on and take off. It will provide support and protect your lumbar spine.