Utilized by blue and red light treat acne, aimed at reducing the symptoms for acne and dermatitis. Blue light helps to kill propionibacterium acnes(P.Acne). Red light hepls to ruedce the symptoms caused by dermatitis, let the skin more smoothly. 15mins treatment for per times, convenient for personal beauty care. 3 times magnfitying mirror on the back, humanized for your skin care.