Mericonn home fetal heart device is suitable for pregnant women about doppler Doppler fetal heart rate monitor is mainly used for fetal heart monitoring. Generally, maternity hospitals provide fetal heart rate monitoring. These fetal heart rate monitors use ultrasonic Doppler technology, so they are also called Doppler fetal heart rate monitors. Ultrasonic diagnosis based on Doppler effect is also called Doppler ultrasonic diagnosis instrument (D-type ultrasonic diagnosis instrument). It is used for diagnosis of heart, blood vessel, blood flow and fetal heart rate in medical clinical diagnostics function 1.Three gear adjustable 2.Intelligent noise reduction 3.Two listening methods 4.Compact and portable 5.Safe and radiation free 6.Sensitive probe