A woman inserts the bullets and will become aroused as they vibrate and move while she moves or walks around. Also builds muscle strength. The bullets are weighted so that you have to contract your muscles to hold them in. This is not only helpful with strengthening vaginal muscles but also helps strengthen bladder control. Can also be used anally and will help with prostate massage. Comes with an extra long power cord for solo or couples use. Requires 2 AA batteries not included.