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This educational infographic explains fetal Doppler technology and fetal heart rate detection using ultrasound-based Doppler principles. It illustrates how ultrasound waves are transmitted and reflected, how fetal heart rate signals are processed, and the factors that may affect signal detection, including gestational age, fetal position, probe placement, maternal anatomy, and movement. The infographic also highlights key features of the ToronTek R88 Fetal Doppler, including digital heart rate display, audio output, high-sensitivity probe technology, portability, and adjustable volume controls. Information is provided for educational purposes only and is not intended as medical advice.