1. photoelectric theory,home use Amber-LED4 2. Reduces fine lines and wrinkles ... friends:This is Langjun, welcome to visit our home useAmber-LED4 Beauty equipment. I will response within ... different types of skin, no side effects;· Easy to use, no need of professional personnel;· Comfortable, painless, non- ... our products, you should be after trained to use the product for the treatment. We have user ...