These double vibrating Kegel balls don\'t just offer a stimulating sensation, but also strengthen your pelvic floor muscles. Willie has 12 powerful vibration settings that are easy to operate with the wireless remote control. The memory function makes sure that the toy remembers your favorite setting\', so you don\'t have to search for it the next time you use the Kegel balls. Willie is rechargeable with the included USB cable. Clean the toy after use with water and toy cleaner.