Features: *5.7 inch LCD screen,compact and light weight *Built-in high-capactity Li-ion battery , above 4 hours working time *Support data storage and software upgrading by external USB Disk *112mm printer. Special extractable paper slot, easy for paper replacement and observation *Manual/automatic FM measurement , automatic fetal status scoring system *FHR signal strength indicator, twins cross channel verification *Power-off data protection for 300cases. 60 hours real-time waveform replay & storage *TemPomTM timing monitor function, avoid overtime monitoring *Support timing printout *Support wire & wireless central monitoring station connection