The smallest model of Natural Contours is compact, yet powerful. This massager measures 10 cm in length and is graduated in width from 2,5 to 4 cm. It is perfect for that out-of-town business trip! For external use. 2 AA batteries (included) All Natural Contours massagers are ergonomically designed to conform to the contours of a woman's body. The models provide three options to meet a woman's needs in positive and highly pleasurable ways. These small technological wonders can also bring needed relief to stressed muscles in such areas as the neck, shoulders or back. Many women are seeking ways to safely and privately explore their capacity for pleasure as well as to relieve stress in their busy lives. Others find that introducing a personal massager improves a couple's intimacy and communication.