The technology is known as Low level laser therapy (LLLT). Sometimes It is also known as red light, cold laser, or soft laser.
It is a form of alternative medicine that uses laser light at low levels or near-infrared light. The light is applied to the surface skin of the body (in our case your scalp), with the intentions of decreasing pain or inflammation, promoting healing of wounds, tissues, and nerves, or for preventing tissue damage.
In laymen terms, LLLT stimulates cell metabolism and fights miniaturization (thinning hair), while revitalizing the hair follicles to grow thicker.
For a more official explanation, Low level laser (light) therapy (LLLT) has been well studied and is used clinically to treat a wide range of conditions including androgenetic alopecia. Several devices have received market clearance for the treatment of androgenetic hair loss and to promote hair growth in men with Hamilton-Norwood IIa-V and women with Ludwig-Savin I-II classifications of hair loss, and possessing Fitzpatrick I-IV skintypes. A widely accepted theory is that LLLT, particularly at wavelengths in the red (visible) range, affects the functioning of the stem cells that cause hair growth. LLLT activates cytochrome c oxidase and increases mitochondrial electron transport [11-17], which leads to an increase in ATP and subsequent reversal of hair follicles from the dormant telogen stage of growth, to the active growth or anagen stage