Smartballs are Fun Factory's updated version of kegel balls.
Inside each Smartball is an almost completely silent inner ball. Any movement you make will cause weights inside the balls to vibrate gently. Each time the pelvic muscles contract or release, this motion causes a subtle but pleasureable sensation. It's a super fun way exercise your kegels and you can wear the Fun Factory Smartballs as long as you like, even during everyday activities or a night out on the town for an erotic experience!