The device is suitable for everyone. However, people who are receiving treatment or have the following symptoms should consult a doctor before using the unit: 1. People wearing a pacemaker or other in-vivo implantable electronic medical device that are susceptible to electrical interference. 2. Patients with malignant tumors. 3. People who have been denied the ability to identify temperature. 4. People with sensory impairment 5. In addition to the above, people who feel particularly unwell. Stop using if you feel abnormal or feel ineffective after use. Use it and consult a doctor.