Fetal Doppler  ultrasound machine is a hand-held obstetrical unit, which
can be used in hospital,  clinic and home for daily self-check by pregnant woman.
It contains components of ultrasonic signal transmitter and receiver, analog signals
processing unit etc. It has audio output and can be connected  with earphone or recorder with audio input.

Safety classification: internally powered equipment, type CF applied part
Display: 38 mm × 32 mm LCD screen
Range of fetal heart rate: 50 BPM ~ 240 BPM (BPM: beats per minute)
Resolution: 1 BPM
Accuracy: ± 2 BPM
Power consumption: <1 W
Rated operational voltage: DC3 V