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This is a quality fetal heart rate detection instrument that uses Doppler principle to obtain fetal heart rate from the pregnant woman's abdomen, and presents fetal heart rate data through voice monitoring, digital display and other ways. You can use it to hear fetal heart sound and calculate FHR to achieve pre-monitoring and fetus caring. Features: High sensitivity probe, no radiation, low-ultrasound power, safety and with high accuracy. Large LED display, you can see the fetal heart rate, battery capacity, and volumes clearly. Equipped with volumes adjustable function, you can adjust the volumes easily according to your demands. Insert the 3.5mm 32 mono or dual channel headphone plug into the headphone jack of the device, you can use the headphone to listen to fetal heart sound, at the same time, the external speaker of the device will be closed, without any sound output. After hearing a recognizable, rhythmic fetal heart rate sound, keep the probe stationary for at least 5 seconds so that the device can measure and display the fetal heart rate correctly. Powered by two sections of AA battery, support continuous operation.(battery is not included) Note: The normal fetal heart rate r-ange is 120-160bpm. 100-120bpm and 160-180bpm are critical intervals, which should be paid attention to. The value below 100bpm and above 180bpm should be high concerned. Specifications: Name: Fetus-voice Meter Material: ABS Color: white Battery: 2 * AA battery (not included) Earphone: 3.5mm 32 Mono -or dual-channel headphones Ultrasonic-operating frequency: 2.5MHz The deviation between the ultrasonic-working frequency and the nominal ultrasonic-working frequency: should not be more than ±15% Overall sensitivity: 290dB (At a distance of 200mm from the probe surface, the comprehensive sensitivity) Fetal heart rate measurement and display-range: should not be less than 65-210BPM The speed of sound: 1520- 1620m/s Acoustic impedance: 1.5- 1.7 x 106 Pa.s/m Acoustic attenuation : < 0.05dB/(cm.MHz) Working environment: Temperature: 5°C-40°C Relative humidity : 25-80% RH Atmospheric pressure: 70kPa-106kPa2 Storage and transportation: Temperature: 5°C-45°C Relative humidity: 9-85% RH Atmospheric pressure: 50kPa-106kPa Viscosity: >15Pa.S PH value: 5.5-8 Service altitude <2000m Package size: 170 * 115 * 50mm / 6.69 * 4.53 * 1.97in Package weight: 160g / 5.64ounce Packing List: 1 * Fetal Doppler 1 * Guideline