... Lights Acne Treatments Skin Tightening Facial Beauty Machine (JB-4800) Principle and Functions: The PDT machine combines the biological activity of ... of the muscle isometric stretching exercise, relaxation quickly enhance facial skin, eliminate eye bags, eye lines, nasolabial folds ... , reactive dull and aged cells, tighten skin, enhance facial contours, recover the energy of skin by detoxification and ...