YONO in-ear ovulation predictor, Bold Violet. The only wearable earbud to measure basal body temperature, which may be used in predicting ovulation, natural family planning and understanding female hormonal health. The YONO package contains a base station, earbud, one set of ear tips with three different sizes and a USB charging cord. iOS compatible (iPhone 6, 6 Plus, 6s, 6s Plus, SE, 7, 7 Plus, iPad); NOT compatible with Andoid devices.