1. automatic diagnosis expert system
2. haveing two years free upgrades of Software

Technical parameters:
Display screen: 25mm×15mm
Ultrasound frequency:3.0MHz
Output intensity of ultrasound:<10Mw/cm2
scope of  FHR measurement and display:40--220bpm
Accuracy of FHR Measurement:1bpm
Power of Voice Output:1W
Ranges of Voice Output Frequency:500dB--3000 dB
Working temperature:0--40
Relative humidity:30%--80%
Scope of Atmospheric pressure:70kPa--106kPa
Power Supply: 9.6VNiMH rechargeable batteries
Input range of adapter: AC100V240V,50/60Hz
Continuous working time:>4 hours