Laser Therapy Hair Growth Comb is indicated to treat Androgenetic Alopecia, and promote hair growth in females , or frontal patterns of hair loss and in males who have Classifications of IIa to V and who both have Fitzpatrick Skin Types I to IV. Laser Therapy Hair Growth Comb is a hand-held comb-shaped low level laser therapy device that emits laser light designed to promote hair growth in women and men. Laser Hair Growth Comb device provides distributed laser light to the scalp while the comb teeth simultaneously part the user's hair to the laser light reaches the user's scalp. Type of laser ,Vdiodes isible red light-emitting, Wavelength 650nm 10nm. 15 min per treatment,3 times per week, spaced out every other day, as little as 16 weeks Color: Material: plastic Package Contents: 1 * Hair Growth Comb Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.