This Sonoline B Pocket Fetal Doppler allows health care professional and expectant mothers to find fetal heart rate and listen to the sound of the heart beat. The handheld obstetrical unit can be used in a hospital, clinic, or even at home as a daily self check. It has components of ultrasonic signal transmitter an receiver, analog singals processing unit, a fetal hear rate calculating unit and an LCD display control unit that is easy to read. This fetal doppler has three workmodes: real time fetal heart rate display mode, averaged fetal heart rate display mode, and a manual mode. It has an audio output and can be listened to with headphone or connected to a recored with audio input. Features include a battery status indicator, built in speaker, probe inspection, backlight, and auto shutoff that helps preserve battery life.