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Feature: A fetal heart rate during pregnancy can help pregnant mothers to reduce anxiety in mothers with a bad pregnancy history. Emotions, relaxation, and reduced troubles in going out to the hospital. Promote the use of accurate and more scientific fetal home monitoring. The better using times of fetal instrument is three times a day. To monitor fetal heart rate, using the accurate fetal heart rate meter. It is helpful to learn more about the health of the fetus. Save money, worry; family fetal heart rate monitoring has reduced the out-of-town hospital testing, hospital testing every time It takes lots of money, and it needs to be tested once every 2 days during pregnancy. High-risk pregnant women, All need to be tested every day, family medical testing chooses cost-effective high state health fetal heart rate can run less hospitals. Color: red + white Product name: Rechargeable Pocket Fetal Doppler Prenatal Baby Beat Rate Detector Material: ABS Weight: approx.300g Screen size: 4.5cm/1.8inch Battery: 2pcs AA battery(not included) Voltage: DC 3V Probe operating frequency: 3.0MHz±10% Fetal heart rate range: 50-230 BPM (per minute) Accuracy: ±2BPM Waterproof: IPX1 Package included: 1x Household Prenatal Baby Beat Monitor Only the above package content, other products are not included. Note: different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.