The Soft Low-Energy Infrared Laser Comb uses 2 AA Batteries it gives complete stimulation while penetrating into the scalp and hair follicles. Low-Energy Infrared is different from natural light it is a Monochrome Wavelength capable to reach its climax, which enables it to infiltrate into substance without any heat effect, or causing any damages or side effect. Modern science research shows that infrared can penetrate superficial tissue to raise the activity of ATP, the main substance in transmitting energy among cells. Therefore low-energy infrared has a strong effect on activating cells, so as to influence tissue replacement, accelerate reorganization, and assist in inflammation resolution. The low-energy hair growth comb uses light to clean your hair root and makes hair radiated, It kills fungus on the scalp and is an effective advanced treatment method which can substitute oral medicine or medicine for external use.