1 month supply. Compare to Answer Ovulation Tracker (This product is not manufactured or distributed by Church & Dwight Co., inc. or Armkel, LLC, distributors of Answer.) Daily results. Daily ovulation tracker. Testing made simple. 99% accurate at detecting the LH surge. No more guessing cycle length. Why test for an LH Surge? Immediately before ovulation, the body produces a large amount of luteinizing hormone (LH). This LH surge will tell your two most fertile days that pregnancy is most likely to occur. Yes (LH Surge): The presence of two lines where the Test Line color is similar to or darker than the Control Line, indicates you have detected an LH surge. No (LH Surge): The presence of one Control Line or two lines where the Test Line is lighter than the Control Line, indicates you have not detected an LH surge. Place the dipping end of the Test Strip in urine for 10-15 seconds. Do not pass Max fill line. Your LH Surge: Your two most fertile days begin with the start of your LH surge. The presence of two similar purple or pink lines indicates that the Daily Ovulation Predictor has detected your LH surge. Contents: 1 vial with 20 test strips and 1 cup 1 English/Spanish instruction insert. The Daily Ovulation Predictor is a simple way to determine when you will be ovulating 24-36 hours in advance and increase your chances of becoming pregnant. A one month supply of 20 Test Strips takes the guesswork out of finding your two most fertile days. Easy to use: Just 1 simple step. Easy to read: Clear results in as early as 4 minutes. Test Daily: 20 Test Strips to track your cycle and LH surge. Packaged in the USA. Made in China.