-Clear Fetal Heart Sound: High performance clear fetal heart sound -LCD Display: Multi-parameter working mode and fetal heart rate display, clear FHR (Fetal Heart Rate) display -High Sensitivity: Medical grade, high sensitivity waterproof probe, no radiation to detect, low ultrasound power, safer to the fetus -Compatible with both earphone and speaker (Earphone NOT included) -Perfect to listen and record your unborn baby's heartbeat when she is 12 week above -Lightweight and easy to carry, You can share your joy - a healthy and strong heartbeat with your lover, families and friends, whether you are at home or out How to use: 1.1. Before using it for the first time, make sure 2 batteries are in 2.2. Press the power button to power on, then adjust the volume 3.3. Lie flat with a cushion pillow, keep legs straight and relax 4.4. Attach the fetal probe to the abdomen to locate the position of the fetus and find out the best direction to the fetal heart 5.5. After hearing regular fetal heart sound, the FHR value will display on the screen in real time Looking for baby's heartbeat sound 1.8-18 gestational weeks: This stage most mothers feel slightly quickening, and fetal heart sounds signal is weak at this stage, suggest an cardiac monitoring after getting up in the morning 2.18-28 gestational weeks: Mother can feel obviously quickened, if found that fetal long time no movement, a number of abnormal or quickened, you should immediately use tire choice for cardiac monitoring 3.28-40 gestational weeks: Cardiac monitoring critical period, fetal hypoxia condition easy happen, suggest monitoring 3 times a day (morning, noon, night) Specification: -Material: ABS -Color: pink + white -Display: 45mmx20mm -Suitable range: more than 12 weeks -Probe working frequency: 2.0MHz±10% -Fetal heart rate range: 50-240BPM -Power supply: 2 AA batteries (not included) -Size: 6.3x3x13cm -Probe size: 3.2x10.4cm -Probe cable: 1.5m