The Dual Hormone Digital Ovulation Test from Clearblue is one of the only tests on the market to detect a rise in estrogen levels (screen will display a flashing smiley face) and your LH surge (screen will display a static smiley face). Peak fertility is displayed constantly for 48 hours after it first appears! Since no two people are the same, the number of fertile days you see is personal to you. To use: Carefully read the instructions that come with the ovulation test. These detailed instructions are filled with information on when to start the testing based on your specific timeline. Remove the test stick from the wrapper and take off the cap. Align the purple arrow on the test stick with the arrow on the test holder, and insert the stick until it clicks. This will automatically turn on the ovulation test for use. Face the absorbent tip downward in your urine stream for 3 seconds. You may also do the test by collecting a urine sample in a dry, clean container and placing the test tip in the urine for 15 seconds. After testing, wait 5 minutes for accurate results. Low fertility will display a clear circle, high fertility will display a flashing smiley face, and peak fertility will display a static smiley face.