Physical characteristics:          Size: 150 (Length) ×96 (Width) ×38 (Height) mm         Weight: 150g±20g (excluding batteries)         Working environment:         Temperature: +5℃~+40℃         Humidity: 15%~85%         Atmospheric pressure: 86kPa ~ 106kPa         Transport and storage environment:         Temperature: -10℃~ +55℃,             Humidity: 10%~93%         Atmospheric pressure: 86kPa ~ 106kPaFHR performance:         Integrative sensitivity: ≥90db         FHR measuring range: 50 ~210BPM (BPM: beat per minute)         Accuracy: ±2BPM,         Speaker power: 0.5W         Battery type: Two pieces of AA batteries(Note: This product does not contain a battery.)Ultrasound probe:        Degree of liquid protection provided by sealed equipment: IPX1         Working frequency: 2. 5MHz±15%         Working mode: Continuous wave doppler          Spatial-peak temporal-peak intensity: < 21.7 kPa         Ultrasonic output intensity: < 10mW         Effective radiating area of transducer: 157mm2±15%Gestational weeks: not less than 12 weeks
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