What is it: The HairMax LaserComb is the first medical device clinically tested and cleared by the FDA to promote hair growth in both men and women with certain degrees of hair loss.Who is it for: Men and women with certain degrees of hereditary hair loss. Suitable for all hair colors. Please refer to the attached PDFs to see which hair-loss patterns are suitable for HairMax use. Women should refer to the Ludwig Savin Classification Scale. Men should refer to the Norwood Hamilton Classification Scale. Everyone should refer to the Fitzpatrick Skin Type Classification Chart for a detailed description of the skin tones/types outlined in each of the scales.Why is it different: The most advanced HairMax model, the Pro 12 LaserComb features 12 laser diodes that bathe the scalp in laser light, stimulating dormant hair follicles to grow new hair.How do I use it: Comb slowly over scalp for eight minutes three times per week. Visible results may be seen in as few as 16 weeks of regular use.From HairMax.