The Edan SD1 Ultrasonic Pocket Doppler can locate the fetal heart rate signal quicker and easier than ever before. The SD1's extremely low radiation level provides a safer and more comfortable experience. Additionally, the SD1 can be used in both clinical and at home environments. This all-in-one doppler device features a built-in speaker and fetal heart rate digital display. Pulse wave technology also helps improves the quality of the sound performance and minimizes interference. The Bluetooth version connects to the Android and iOS APP to track the growth of the baby and display important information. With advanced features in a doppler you can take virtually anywhere, the SD1 embodies mobility and excellent performance.