Works with iPhone 12 Pro only. Select correct iPhone model before ordering. Measures all 4 fertility hormones on a single test strip, showing you a full picture of your cycles. Identifies 6 fertile days in your cycle by measuring Estrogen & Luteinizing Hormone (LH) levels. Measures PdG (urine metabolite of progesterone) to confirm ovulation. Measures FSH to track follicle growth. Comes with a free easy-to-use App which shows charts and actual values of your hormones.