The BPL Fetal Doppler FD-03 is a handheld device that uses non-invasive ultrasound to allow expecting parents and healthcare professionals to listen to and monitor a baby's heartbeat during pregnancy. It features a high-sensitivity probe, an LCD display showing the fetal heart rate and waveform, and both a built-in speaker and a headphone jack for audio. The device is portable, has a rechargeable battery, and can detect the heartbeat as early as 12 weeks.