Safety standards: 1.Symbols IEC 60601-1 "Medical electrical equipment Part I: General requirements for safety"2.Comply with IEC 60601-2-37 "Medical electrical equipment - Part 2-37: Ultrasound diagnostic and monitoring equipment safety requirements"3.Comply with IEC 60601-1-2 "Medical electrical equipment Part 1-2: General requirements for safety Collateral standards: electromagnetic compatibility requirements and testing" Specification: Size: 138mm x 96mm x 32mm Color: white Weight: 150±20g (with battery)Working Environment Temperature: 5 ℃ ~ 40 ℃Humidity: ≤80%Atmospheric Pressure: 86KPa ~ 106KPaStorage and Transportation: Temperature between -10 ℃ ~ 55 ℃Humidity:＜93% RHAtmospheric Pressure: 86KPa ~ 106KPaDisplay Screen: 35mm x 28mmPower: DC 3V (2 x AA) alkaline batteriesGeneral Sensitivity: At a distance of 200mm from the probe surface, the general sensitivity is 91 dBDisplay Range: Shows the range of 50-210bpm. In the range of 50-210 bpm, the error is ± 2bpm (digital display)Ultrasonic Output Power: 20mWSkin Irritation: NoneSound Speed: 1520-1620m/sAcoustic Impedance: 1.5-1.7x106Pa.s/mAcoustic Attenuation: 0.05dB/(cm. MHz)Viscosity: 15Pa.sPH Value: 5.5-8Working Frequency: 2.5MHz±15%Peak Negative Pressure: 20.0KPaOutput Beam Intensity Lob: 8.51mW/cm2Spatial peak time average derived sound intensity Ispat: 7.00mW/cm2 Package: 1 x Main Monitor1 x Ultrasonic Transducer1 x User Manual

Attach the probe to the abdomen to locate the position and find out the best direction to the heart.After hearing regular heart sound, the FHR value will display on the screen in real time.Time weeks: not less than 12 weeks.