OvulaRing is an easy and accurate way to find out about your cycle health and to accurately determine your fertile days - developed by gynecologists and suitable for all cycle types. The flexible plastic ring is placed into the vagina and cannot be felt by the user. It continuously measures the body core temperature, which correlates with the hormones in your cycle. The evaluation software analyzes the data and determines your individual fertility patterns. Thus, ovulation day, daily conception probability and prognosis of the fertile days for the following cycle can be indicated.