What is the fetal doppler work

The fetal Doppler uses sound waves to pick up your baby's heartbeat

Most women first hear their baby's heartbeat during a routine checkup that uses the fetal Doppler early in their pregnancy. Many ultrasound machines also allow the heartbeat to be heard even before it can be heard with a handheld Doppler. Most women now get an ultrasound prior to 12 weeks.

FD200 0

Pocket Fetal Doppler mainly applies to detect the fetal heartbeat rate from the twelfth week;
LCD can display FHR, synchronous FHR signal, battery indicator, volume of sound and alarm indicator accurately;
TFT LCD display for use conveniently at night;
Automatic power off ( one minute), self-detect function, and alarm function when FHR is out of the normal range or battery power is in shortage;
Built-in speaker and collocated with earphone jack;
2.0MHz probe.

Ultrasonic frequency: 2.0MHz?10%
Ultrasonic intensity: 10mW/cm2
Comprehensive Sensitivity: 90dB
FHR range: 60--210bpm(?2bpm)
FHR alarm range: 100bpm or 160bpm