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To use the product for the first time, please charge it for approx. 3-4 hours. It is not recommended to fully discharge the battery. If the power supply flashes, please charge in time. Connect the cable of the Type-C port to the charging port of the product and plug the other end of the USB interface into any 1.2A USB charging head to connect to the power supply. Before use, make sure you do not have nerve disorders of the legs or skin sensor disturbances, injections of metal, silicone or plastic into the knee due to fractures or surgery, are not able to perceive heat, knee consequences due to traffic accidents, easily affected by electromagnetic factors such as pacemakers. Malignant tumors disease, heart disease, instability at the beginning of pregnancy or shortly after birth, sensory disorders caused by diabetes, scars on the skin, osteoporosis, severe fractures, sprains, muscle pain, acute pain, medical conditions or other conditions that could be affected by the use of the product.