With the help of a pocket fetal doppler, you can fetal heart beat as early as 10-12 weeks. The Sonoline B Professional Pocket Fetal Doppler has an LCD display with backlight for easy and quick reading. To ensure accurate and high performance reading, the monitor has all the components found in an ultrasound signal transmitter and receiver. There is an FHR calculating unit, a unit for analog processing and a modernized LCD display control unit in the device. The device is equipped with three modes for accurate functionality - real-time FHR display mode, averaged FHR display mode, and manual mode. The main features of the doppler include a battery status indicator and built in speaker.