This all new P.S. I Love You hand held led low light hair therapy scalp massager. Helps with hair growth. By using led Low-level light therapy (LLLT) using red or near infrared light is scientifically proven to treat genetic forms of hair loss (androgenetic alopecia). Red light therapy has been shown to cause hair to regrow in the crown area and along the hairline, the most common places that men tend to lose their hair.