Features:continuous montoring of fhr & ualarge lcd display of fhr & ua as traceplain paper recordingcomputer interfacepatient data stroge up to 36 hourssimultaneous display of twins tracestechnical specificationspecificationscoddlegraphcoddlegraph-d ultrasoundtechniquecontinuous doppler with autocorrelationcontinuous doppler with autocorrelationfrequency2 mhz1.5 2 mhzintensity < 10mw sq.cm < 10mw sq.cmrecorder typeinkjet on plain paperinkjet thermal plain paperfhr chart width7 cm 8 cm selective7 cm 8 cm selectivescaling30 20 bpm30 20 bpmrang30-240 50-210 bpm30-240 50-210 bpmresolution1 bpm1 bpmchart speed1 2 4 cm min1 2 3cm min.