1). Clear Fetal Heart Sound. Normal Fetal Heart Rate is usually between 110 and 200 beats per minute. The fetal heart rate may change as your baby responds to conditions in mother's womb. Since, its a doppler therefore it is user dependent and requires practice to operate. Results can vary depending upon the operator's skill and practice. 2). LCD Display. 3). High Sensitivity. 4). Perfect to listen and record your unborn baby's heartbeat when he/she is 12 weeks above. 5). Lightweight and easy to carry. 6). Power-saving 60 seconds automatic shutdown. 7). Material: ABS Plastic. 8). Color: Pink+BLUE Display: 45mm20mm. 9). The product does not contain any couplant. We recommend using a couplant instead of the common aloe vera gel, also known as ultrasonic couplant. 10). For detailed safety instructions and other requirements, read the Fetal Doppler Operational Manual provided with the product. Please make sure that you carefully read the Operational Manual before using the product. 11). After turning on the device, apply gel on the probe, lie down, press the probe on the belly with a little force, and slowly move the probe to search for fetal heart rate. When you hear a regular roaring sound, it is the fetal heartbeat. At this time, you need to press the probe firmly, and the machine will measure the fetus's one-minute fetal heart rate in a few seconds. The fetal heart rate usually fluctuates between 110-160. (It is recommended to slowly detect the fetal heart rate from the lower abdomen upwards.) 12). Please hear the correct fetal heart sound before looking at the numbers. If no regular fetal heart sound is heard, the number displayed by the machine is invalid. 13). The product body has a built-in intelligent noise reduction and sound insulation unit, which can effectively reduce noise and make the output clearer. The product has high sensitivity medical grade waterproof probe. The product has no radiations and safer to the fetus. Now you can share your joy - a healthy and strong heartbeat with your lover, families and friends, whether you are at home or out. 14). Probe operating frequency: 3.0MHz 10%. Fetal heart rate range: 50-240. 15). BPMPower: 2x AA battery (For transportation reason , batteries are not allowed to be shipped, you need to arrange it yourself). 16). Size: 6.3x3x13cm /2.5"x1.2"x5.1". Probe Size: 3.2x10.4cm/1.3"x4.1". Probe cable: 1.5m/59. 17). How to use: 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 position reference map. First trimester (12-24 weeks) Belly button ~ 5 points below left, middle and right. Second trimester (24-32 weeks). The midline of the navel and the 4 points below it. Third trimester (32-40 weeks). Extend 4 points in the oblique direction of the navel.