These smart balls make it possible to train your pelvic floor muscles in a playful and fun way. During everyday activities the Smartballs duo trains the sensitivity of the inner muscles, strengthening the pelvic floor muscle. The Smartballs duo with two balls are perfect for all those who have already trained successfully with the Smartball uno. Muscles that are in shape mean more sensation during sex, in other words make the climax after training possible! Smartball duo is extremely quiet, smooth running and the steady, fast rotation of the inner balls has been developed by some very innovative technology. An ergonomically shaped finger hollow makes insertion easy. A woman can go about her day without interruption and at the same time be training diligently. The Smartball duo can be inserted in the vagina lengthwise and the retrieval band remains outside the body. Some may be a little disappointed that using vaginal balls doesn't lead to orgasm. However, sex after training is even more passionate and enjoyable. A woman has more sensation during sex. And for the man, the snug hold feels great.