The Magic of I Rub My Wormie will be obvious after spending a little personal time together. And like all the products from Big Teaze Toys, there are always a few special features worth mentioning. First, let's talk about power. We at Big Teaze Toys, decided to design and build the world's Most Powerful (and cutest!!!) Waterproof Massager. To make sure the power is there when you need it, your Wormie uses (2) C-cell batteries (not included) for maximum performance.