The Funn Buddies collection was built on 3 ideas...Easy Powerful and Convenient to use. One button to push 7 powerful settings of excitement but small lightweight and fully submersible massager. Simply press down the tabutton in the middle of the unit until the light appears now you can continue to press the button to adjust speed and tempo of the toy. To turn off simply hold the button down firmly until the light goes out. Includes magnetic recharging doc that plugs into USB (3ft USB cable included) Dimensions: 4.8 High x 1.85 Diameter.