FD-01 Keeping track of your baby?s heart rate and helping determine the strength & duration of your contractions. BPL FD-01 is an ultrasound Foetal Doppler that is safe to be used on every pregnant women. It provides an audible simulation of the foetal heartbeat using the Doppler Effect. With a large LCD display capable of showing Foetal Heart Rate from 16th week of gestation. BPL FD-01 comes with 3.0 MHz high sensitive ultrasound probe and Built in loud speaker. Low battery indication and Auto shut down feature saves battery life.