Handcrafted from terahertz ores, the diamond-cut roller transmits terahertz waves which help the Fuji Shiitake Age-Defying serum (30ml) to penetrate deeper into skin. Containing 8 amino acids, Kojic acid and vitamin C, the serum and roller help to treat pigmentation, acne, lines and firm up skin. No battery or solar charging needed. Comes with a one-year international warranty. GIFT WITH PURCHASE: FREE FUJI SIITAKE AGE-DEFYING SERUM (3ML X 2) INCLUDED