... .CE 4.Manufacturer(OEM/ODM) price QZ-9938 Portable rf machine for home use Working Theory:Monopolar Radio Frequency takes that epidermis balances normal ... , neck line, double chin, skin smoothingEye: the RF is effective for eyelid-sagging, crows- feet, wrinkles under eye and pouchChest: Enhance ... .Thin face promotion, eliminate two chins. QZ-9938 Portable rf machine for home use