Features Probe:Solid and durable,anti-shock and anti-falling down Patent:Special fetus awaking function within FHR probe Three to one design:Special three to one design among FHR probe,TOCO probe,fetal movement marker,avoid twisting Quality speaker take more clearly and loudly Operate and control mutually with center monitor. Specification Ultrasound Multi wafer,wide wave-beam Ultrasound frequency:1.5MHz+3% Ultransound intensity:<5mW/cm2 TOCO transducer:External transducer FHR range:30-210bpm TOCO range:0-100(relative unit) Power:AC 220V 50Hz Paper:112mm thermal Weight:3.65kg Size:340mmx310mmx125mm Working condition:Temperature 10C-45C Humidity 10-80%