The Clearblue Fertility Monitor helps women get pregnant by detecting two key fertility hormones, Luteinizing (LH) and Estrogen (E3G), through a urine test to identify up to 6 fertile days in a woman's cycle. It is 99% accurate at detecting the LH surge which signifies imminent ovulation. The home-use monitor provides a simple, natural, and non-invasive way to track a woman's fertility without medical visits.