Q1: When can I start using it? Is it safe? How long can I use it each time?

A: It is usually recommended to start using it after 12 weeks of pregnancy. Before 12 weeks, the uterus is in the pelvis, and the fetal heartbeat is low with a weak signal, so it is hard to find. After 12 weeks, it can usually be found on both sides below the navel. Empty your bladder before use, and lie flat and relax. This product is an ultrasound Doppler device with zero radiation. When used correctly, it is safe for the mother and fetus. It is recommended to use it 2–3 times per week for no more than 10 minutes each time. It cannot replace hospital fetal monitoring or prenatal checkups.

Q2: How can I find the fetal heartbeat quickly and accurately?

A: Apply enough medical ultrasound gel, place the probe gently against the abdomen, and do not press hard. In early pregnancy, move it slowly above the pubic symphysis. In the second trimester, look on both sides below the navel. In the third trimester, adjust according to the fetal position. It is usually easier to hear on the side of the baby’s back. Move slowly and adjust the angle slightly. A fast, regular heartbeat that sounds like galloping hoofbeats is the fetal heartbeat. If the sound matches the mother’s pulse, it may not be the fetal heartbeat; keep moving to search.

Q3: What is a normal fetal heart rate? What should I do if the reading fluctuates or I cannot find the fetal heartbeat?

A: A normal fetal heart rate is 110–160 bpm. Occasional fluctuations are often related to probe movement, fetal movement, maternal activity, or not enough gel. You can stay still, apply more gel, hold the probe steady, or use average mode. Common reasons for not finding it include early gestational age, changes in fetal position, moving too quickly, not enough gel, thicker abdominal fat, a full bladder, or low battery. You can empty your bladder, relax, apply enough gel, move slowly, and try different angles. If you cannot find it after several attempts, try again another day or consult a doctor. If it remains above 160 bpm or below 110 bpm, or is unstable for a long time, seek medical attention promptly.

Q4: What should I do about batteries, charging, and automatic shutdown?

A: Most models use two AA alkaline batteries, and some support a 1000 mAh lithium battery. Do not mix old and new batteries or different types of batteries. There is a low-battery warning. The device automatically shuts down after about 60 ± 10 seconds of inactivity. Do not use it while charging. If you will not use it for a long time, remove the batteries.

Q5: What should I do about the gel and cleaning/maintenance?

A: Medical ultrasound gel is recommended. After use, turn off the device and wipe the probe and main unit with a soft cloth dampened with a little water or 75% alcohol. Do not soak, rinse, or use corrosive cleaners. Store it in a cool, dry place, away from high temperatures, moisture, and direct sunlight.

Q6: How do I use the Bluetooth/Wi-Fi and fetal movement recording functions?

A: If Bluetooth/Wi-Fi is supported, connect to your phone or tablet according to the instructions to sync data. Fetal movement recording can be turned on in the menu. When you feel fetal movement, press the button to record it, and you can review the records later. If these functions are not supported, they cannot be used.