1. To avoid malfunction or fire, please stop use in case of unusual hot.
2. Please do not drop or clash the device.
3. Please apply serum constantly during use.
4. Please do not use it if the power cord is damaged.
5. Below conditions are not allow to use:
Heart disease, pregnant,fever, communicable disease, cancer, open cuts, acute disease, hypotension, hypertension, install pacemaker, artificial heart or lung,during medical treatment, skin disease, sunburned, over sensitive people,anapetia.