Elvie is an award-winning exercise tracker for the pelvic floor. Simply place inside, connect to the app and track kegel strength. As the muscles contract, the on screen gem lifts, allowing users to see their pelvic floor exercises in real time. The six unique games were designed with the help of physiotherapists and experts from Imperial College and University of Oxford. From Speed, which challenges fast-twitch muscles, to Hold which builds endurance, the exercises give the pelvic floor a full workout. Elvie is the most personal trainer - motivating and correcting as users exercise, and tracking progress over time. Featuring breakthrough technology, Elvie helps prepare the body for pregnancy, speed up recovery after childbirth and regain control.WaterproofMedical-grade siliconeRechargeable2 Year WarrantyGreat for pregnancy and post-childbirth!Compatible with iPhone and Android phones (4S and 4.3 and newer)Includes: Pelvic floor exercise tracker, Carry case (doubles as a wireless charger), Optional cover for custom sizing, Quick start guide, Micro USB charging cable.