iYyee is an intelligent basal body thermometer specially designed for women. Working with iYyee device, it detects your basal body temperature based on your sleeping and all night temperature datas, and draws BBT curve automatically. Based on the collected data, It can predict your menstrual cycle precisely and provides fitting dietary and skin care advice accordingly. According to the BBT curve, women can easily know the ovulation day and thus increase the conception rate greatly. iYyee is indeed your best friend forever.