1. Theory: can produce piezoelectric effect and thermoelectric effect.
2. Self-heating is based on natural mineral ms tomalin, through it and nano materials' modification, releases far infrared and anion, brings micro electric effect to people.
3. Apply to warm waist, stomach and kidney, waist disease ,intestines and stomach discomfort and body chilly tepid physiotherapy.
4. Model Number: WHB-L(62cm-84cm), WHB-XL(87cm-93cm).
5. About  15 minutes , the skin gradually feel tingle and fever .