Sonoline B handheld Doppler can meet routine examination requirement of obstetricians, midwives, pregnant women and vascular. It is a high performance model with FHR digital LCD display. It has three heart rate processing modes: real-time FHR display mode, averaged FHR display mode and manual mode. It has audio output, and can connect with earphone or recorder with audio input. RFD-B2 has a slim, power saving and interchangeable ultrasound probe.