Meet Tempdrop: a wearable device for fertility tracking. It has a smart sensor that makes fertility tracking easy for everyone. Users have to put the sensor on before going to sleep and take it off when they are up. The device will send readings to fertility apps. This Bluetooth device does not transmit anything when you are wearing it. It uses Bluetooth LE. Tempdrop will be compatible with Android and Windows apps. You can support this project on Indiegogo.