1. automatic diagnosis expert system 2. haveing two years free upgrades of Software Technical Parameters Fetal Heart Rate Working Frequency: 1.0-3.0 MHz(optional) Working Mode: pulse ultrasound DopplerMeasurement Range: 50-210bpm Measurement Accuracy:±1% ±1bpmAlarm Range: Upper: 160, 170, 180, 190 bpm(optional)Lower: 50, 60, 70, 80, 90, 100, 110, 120 bpm(optional)Maximum audio output power: 1. ...