This waterproof Dolphin Finger Diver will keep you entertained for hours... in and out of the water! The removable dolphin shaped sleeve with finger ring is made from hygienically superior Silicone. Inside the sleeve, the powerful bullet massager simply twists on and off for fantastic vibrations. While four watch size batteries are required to get the fun buzzing, eight are included to make your pleasure last twice as long. Make a splash using this powerful massager!