... and body 4.CE certificate HR-802A Monopolar Radio Wave Frequency Machine,RF Skin Tightening MachineTheory of Monopolar ... assurement of skincomfortable, harmless, it uses RF electric wave to produce heat exchange, precisely attainsskin deep, stimulates inner ion of ... will be forced rapidmovement, vibration or attrition, then produce heat energy. At same time, under effect ofpolarized molecule resonance, ...