... 4.CE certificate HR-802A Monopolar Radio Wave Frequency Machine,RF Skin Tightening MachineTheory of Monopolar RF MachineMonopolar RF ... shrinking, stimulate toexcrete much new collagen to make up interspace of the shrinking or lost collagen protein,and ... ;Blood vessel dilatation;Enhance oxygen fluid, advance oxygen-taking exercise, upgrade blood and lymphcirculation, exhaust toxin andwaste, activate ...