... unit 2.Easy to hear baby's heartbeat 3.CE APPROVED 4.fetal heart listener Fetal Doppler/Fetal heart Reate Doppler/heart Rate monitorGland ... current, ultrasound, or radio waves, some doctors use Doppler ultrasound equipment that produce artificial noise, but our ... stethoscope technology, which gives you excellent sound quality. Convenient to use, powered by battery, gel is not necessary, every mother ...