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Two display modes: numerical mode and curve mode. Two-color (blue and yellow colors) OLED screen gives you clear readings, even though you use it in the dark night. All-in-one design with a streamlined appearance provides a good user experience. You can carry this compact, handheld device around whenever you like. It offers a glanceable display of signal strength so that you will easily find which spot is best for measuring the fetal heart rate. It adopts the autocorrelation algorithm to process doppler signals; as long as your pregnancy lasts for more than 12 weeks, the fetal heart rate can be detected. Just like other types of fetal monitors, this device also adopts the advanced DSP (digital signal processing) technology and FHR (fetal heart rate) algorithm to ensure the accuracy and reliability of measured results. The comparison chart shows the optimized algorithm significantly reduces noise interference and increases the chance of detecting fetal heart sounds.