... red light's wavelength is 630 mm,it has characteristics of high purity,strong light source,energy density wellpreportioned,has notable effects in skin ... to full on their own,accelerate blood circulation,increase skin elasticity and improve withered and yellow,dark condition of skin,has ... not operate the laser pen,small photon head on eyeb4.Irradition nurse on paritial should be keep for over 15 munutes ...