1. automatic diagnosis expert system 2. haveing two years free upgrades of Software Technical Parameters:Fetal heart rate: Multi-wafer, wide wave beam, pulse working mode, high sensitivity.Ultrasound intensity: <5mW/cm2Working Frequency: 1.0—3.0MHZ(optional)Measurement Scope: 30-240bpmAlarming Scope:Upper limit: 160, 170, 180, 190 bpmLower limit: 90, 100, 110, 120 bpmResolution: ±1bpmAccuracy: ± ...