The Big O is the world's only nine speed auto-changeable vibrating ring. It's what everyone really wants, the big orgasm. The Big OÀô is designed with a specially enhanced silicone gel ring. It stimulates the female clitoris with extended ticklers for reaching orgasm, and also effectively prolongs the length and firmness of the male erection. The Big OÀô is the state-of-the-art in adult, toys increasing pleasure for both. Multiple use Replaceable batteries Waterproof Duration of intense vibrations: 80 minutes Instructions on how to change batteries are provided within it's packaging.