Sonoline B Pocket Fetal Doppler is a hand-held obstetrical unit, which can be used in hospital, clinic and home for listening to a baby's heartbeat. It contains components of an ultrasonic transducer and receiver, analog signal processing unit, Fetal Heart Rate (FHR) calculating unit, LCD display, Control Unit. The Sonoline B Pocket Fetal Doppler is a high performance model with (fetal heart rate) LCD digital display. It has 3 Operating Modes: Real-time FHR display mode, Average FHR display mode, and manual mode. It has a built-in speaker for audio output and is equipped with a earphone plug so one can listen privately.