The Clearblue Fertility Monitor typically identifies up to 6 fertile days - it not only shows you your 2 Peak Fertility days, it can also inform most women of an extra 1-5 days of High Fertility prior to their Peak Fertility. Since your partner�s sperm can survive in your body for several days, having sex on all of these days can lead to conception.The Clearblue Fertility Monitor a natural, non-invasive and easy-to-use device that consists of Test Sticks and a hand-held Monitor to identify changes in the hormones that control your fertility. The Monitor records your personal cycle to build up a picture of your most fertile days. This is a perfect tool to schedule the best times of the month to conceive a baby. This is truly wonderful.