... Hongnice,Take Beauty 1.RF PrincipleProtable Monopolar RF Beauty Machine for Home Use takes that epidermis balances normal temperature, RF electric ... assurement of skin comfortable,harmless.It uses RF wave to produce heat exchange,precisely attains skin deep,stimulates inner ... layger. When deep collagen tissure is heated up to 45 centigrade to 60 centigrade,it will naturally produce instant shrinking, ...