The aim of the cup is to either keep whatever is being sprayed up the vagina out of the cervix, or to intensively spray the stuff into the uterus. It's a multipurpose overengineered douche.
The purpose of the speculum-style arms is to un-wrinkle the vaginal walls for optimal douching power.
We hope we don't need to tell you that the vagina needs absolutely NONE of these interventions, and that sounds uncomfortable as hell.