Femometer smart basal thermometer syncs basal body temperature (BBT) to the intelligent Femometer app on your smartphone to record, track, and chart your BBT. And it intelligently analyzes your BBT and calculates pregnancy rate of every day, thus helps with pregnancy, contraception, early-stage pregnancy monitor and manage your menstrual cycle better. Femometer improves the accuracy of manual input of traditional products, and simplifies the complexity of the basal thermometer results. Compatible With: Apple devices: iPhone 5+(iOS 8.0+); Android devices: with 4.3+ system and Bluetooth 4.0.