1. Skin has wound, avoid wound or do not operate this area.
2. People who has sever couperose skin expansion cannot use it.
3. Heart disease patients(such as arrhythmia), especially with cardiac pacemakers are banned.
4. Eyes, face injuries or inflammation are prohibited.
5. It is forbidden to wear contact lenses when operating.
6. Pregnant women are forbidden to do.
7. Major surgery patients, diabetes patients are banned.
8. Any mental in the body is forbidden to operate.