Meet the YONO: a smart thermometer that sits in your ear and measures your core body temperature for fertility tracking. It tells you the basal body temperature without making you uncomfortable. YONO creates an enclosed area in your ear canal to prevent external factors from impacting its measurements.
YONO is designed to let you sleep on it while its inside your ear. It does not feature Bluetooth connectivity, but you can use its Base Station to sync your data to your iOS or Android device. The companion app provides you with data and charts. More information is here.