Ultrasound Foetal Heart Monitors are used mainly for foetal cardiac monitoring,Intrauterine Depth, Multiple Pregnancy, Cardio Vascular Diagnosis,Paediatric Application, Continuous monitoring of foetal, etc. Works on mains as well as on battery. Facility for Tape Recording. Ear Phone Facility. Heart Beat Indicator. TECHNICALDATAFrequency 2MHZ.Power Supply Battery of 9 volts.(Single Battery) 220 volts.