Pregnancy: The use of this product is strictly prohibited, especially during the first six months of pregnancy. 2. Internal Medical Devices: Individuals with implanted medical devices, such as pacemakers, should not use this product. 3. Severe Cardiac Conditions: Individuals with severe heart conditions should not use this product. 4. Open Wounds or Bleeding Tendency: This product should not be used by individuals with open wounds, bleeding, or a severe bleeding tendency. 5. Risk of Impacted Stones: Individuals with the risk of impacted stones should not use this product. 6. History of Thromboembolism: Individuals with a history of thromboembolism should not use this product. If you experience any discomfort or abnormalities during use, reduce the output power or stop using the product immediately, and consult a doctor.