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How to Use Your Fetal Doppler

Your Newbeat fetal doppler is ready to use out of the box. This guide covers setup, finding your baby’s heartbeat, reading the display and keeping the device in good condition — for all four current models: JSL-T501, TK-T802, W8-25 and TK-T805C.

Last updated: November 2026

Quick start in five steps

1. Fit the batteries. Open the battery cover and insert the two AA batteries supplied (alkaline only). If your unit came with a rechargeable lithium pack, charge it fully first.
2. Apply ultrasound gel. Spread a generous layer, about the size of a coin, on the probe face. Gel is what carries the sound — without it you will hear very little.
3. Power on and lie back. Lie semi-reclined with your abdomen exposed, then press the power button. The screen lights up and the speaker gives a short tone.
4. Place the probe low on the abdomen. Start just above the pubic hairline, in the middle, with the probe face flat against your skin.
5. Tilt slowly until you hear the heartbeat. Do not slide quickly. Rock the probe through small angles, changing direction every few seconds, and watch the display for a steady rate.

What’s in the box

• 1 × fetal doppler unit
• 2 × AA batteries (or 1 × 1000 mAh rechargeable lithium pack on models that ship with it)
• 1 × 30 ml ultrasound gel
• User manual

Everything needed for a first listen is included — no separate gel purchase required.

Before your first use

• Read the printed manual first. Button functions vary slightly between models, and the manual covers your exact unit.
• Expect to hear the heartbeat from around 12 weeks. Before that the uterus sits low behind the pubic bone and the signal is often too faint for a handheld doppler. Hearing nothing earlier than 12 weeks is normal — try again in a week or two.
• Use a quiet room. Background noise makes the heart sound harder to pick out, especially on a first attempt.
• Have a comfortably full bladder in early pregnancy; it lifts the uterus into an easier position to reach.
• Keep sessions short. Five to ten minutes is plenty. Listening longer brings no extra benefit.

Finding the heartbeat, step by step

1. Prepare the probe. Wipe the probe face clean, then apply gel generously. Top up the gel every few minutes — it dries and the signal fades with it.
2. Start low and central. Place the probe about two finger-widths above the pubic bone, angled slightly downwards toward the pelvis.
3. Move in small increments. Fan the probe slowly left and right, then up and down, keeping the face in full contact with the skin. Pressing harder does not help; good contact does.
4. Listen for the right sound. The fetal heart sounds like a fast, rhythmic gallop — much quicker than your own pulse. The placenta and cord produce a slower whooshing sound; keep looking until you find the gallop.
5. Hold still and read the rate. Once the sound is steady, hold the probe in place and let the display settle. Confirm the number stays consistent for several seconds before you trust it.
6. Clean up. Switch off, wipe the gel off the probe with a soft dry cloth, and store the unit in its case.

Reading the display

The large number is the fetal heart rate in beats per minute (bpm). On the JSL-T501 the display reads 65–210 bpm with an accuracy of ±2 bpm; the other models use the same measurement principle with their own screen sizes.

All four current models offer three measurement modes. Choose the one that matches what you are doing:

The JSL-T501 and TK-T805C have a built-in Φ50 mm speaker, so everyone in the room can hear the heartbeat. Some units also support fetal movement recording and Bluetooth or Wi-Fi output; these are optional configurations, so check the specification on your product page if you need them.

Which model do I have?

Check the model number printed on the back of the unit or on the box, then match it here:

Tips for a clearer signal

• More gel, not more pressure. A dry patch between probe and skin kills the signal. Top up the gel instead of pushing down.
• Change the angle, not just the position. The beam has to point at the heart, so tilt the probe in small arcs as you move.
• Listen before you look. Find the gallop by ear first, then hold still and let the display catch up.
• Try a different time of day. Some babies are much easier to find when you are relaxed and lying on your back.
• Avoid listening straight after a big meal or when the baby is very active — movement makes the signal wander.

Troubleshooting

Cleaning, storage and batteries

• Wipe the probe and housing with a soft cloth or an alcohol wipe after each use. Never immerse the unit in water and never place it in a steriliser.
• Remove gel residue before storing — dried gel hardens and reduces sensitivity next time.
• Take the batteries out if the device will not be used for more than a month, to prevent leakage.
• Store in a dry place, away from direct sunlight and heat. The optional carrying case keeps the probe protected.
• Do not drop the probe; the transducer element inside is the most delicate part of the device.

Safety notes

Frequently asked questions

How early can I hear the heartbeat at home?

Most parents can find it from around 12 weeks. Before that the uterus is still low behind the pubic bone and the signal is often too faint for a handheld doppler — this is normal, not a sign that anything is wrong.

Is a fetal doppler safe to use at home?

Dopplers use ultrasound, not radiation, and these units are built with ROHS-compliant materials. Used briefly and occasionally as directed they are considered safe. Keep sessions short and do not use the device as a substitute for professional care.

Do I need to buy ultrasound gel separately?

No. A 30 ml tube is included with every unit. Any water-based ultrasound gel works as a replacement once it runs out — do not substitute lotion, oil or water.

Why can I hear the heartbeat one day and not the next?

Baby’s position, bladder fullness, the amount of gel and how much the baby is moving all change the signal. A quiet day is common and is not a reason for alarm on its own.

Can I record the heartbeat or the baby’s movements?

Fetal movement recording is available as an option on all four models, and Bluetooth or Wi-Fi output can be specified on request. If you need these features, check the configuration on the product page before ordering.

What kind of batteries does it use?

All four models run on two AA alkaline batteries. The TK-T802 and TK-T805C can also be supplied with a 1000 mAh rechargeable lithium pack, which makes the unit slightly heavier but avoids disposable batteries.

What does the warranty cover?

Every doppler comes with a 1-year free replacement for qualifying manufacturing defects, plus a 30-day money-back guarantee if you are not satisfied. See the Warranty Policy and Refund & Returns Policy for the details.