The O Wow vibrating ring from the Screaming O is a good ring among a wide field of stretchy rings. It\’s stretchy so it\’s easy to get on and comfortable to wear. Although its wireless bullet is powered by three watch batteries, it still packs a punch. It\’s waterproof, so you can use it in the shower or tub. It even comes with a set of batteries installed, so it is ready right out of the package and it also has a second set for when the first ones wear out. What else could you ask for?