3.0 mhzfupler heart rate monitor Features: 1. Clear fetal heart sound: High performance fetal heart sound. Intelligent noise reduction makes the fetal heart rate clearer. The product body has a built-in intelligent noise reduction unit and sound isolation, which can effectively reduce noise and make the output clearer. 2. LCD display: Multi-parameter working mode and fetal heart rate display, clear display (fetal heart rate). 3. High sensitivity: Medical grade, high sensitivity resistant probe, no radiation to detect, low ultrasound power, safer for the fetus Ipx1 waterproof, waterproof and durable, detachable, designed separately outside the fetal heart rate host, easy to replace, waterproof and durable 4. Compatible with both headphones and speaker (headphones not included). Built-in audio output interface, you can clearly listen to your baby's heartbeat 5. Perfect for listening to and recording your unborn baby's heartbeat. 6. Lightweight and easy to carry, you can share your joy-healthy and strong heartbeat with your lover, families and friends, whether you are at home or outside. 7. Energy saving 60 seconds automatic shutdown When the device is turned on for 60 seconds without any operation, it will shut down without wasting power. Specification: Material: ABS plastic Color: Pink + Blue Display: 45mm × 20mm Suitable range: 9 weeks above Test operating frequency: 3.0MHz ± 10% Fetal heart rate range: 50-240bpm Power: 2x AA battery (For some reason, batteries are not allowed to be shipped by air, you need to prepare it by yourself) Size: 6.3 x3 x13cm/2.5" x 1.2" x 5.1" Probe size: 3.2 x 10.4cm/1.3" x 4.1" Probe cable: 1.5m/59 How to use: The best time to monitor fetal heart rate Get up in the morning Within 30 minutes Within 60 minutes after lunch Within 30 minutes of bedtime Fetal heart rate reference map First trimester (12-24 weeks) Belly button ~ 5 points below the left, middle and right. Second trimester (24-32 weeks) Midline of the umbilicus and 4 points below it Third trimester (32-40 weeks) Extend 4 points diagonally from the umbilicus