Home electrolysis roller eradicates 4"-wide areas of unwanted hair permanently and painlessly. Emits safe, low-level electrical energy that reacts with conductive gel to destroy hair follicles at their base. Great for face, underarms, bikini line, and legs. Includes 2 AAA batteries, tweezers, 3 oz. gel, and zippered travel case. 2"W x 4 1/2"L.