... the best technique is to begin with the transducer (probe) on the midline of the abdomen (above the pubic line) ... A 2 Mghz probe is best for early detection, standard on Hunt Leigh FD1+ and D920. A full bladder can make ... ModeMean, Average, Continuous, BacklightDisplay3 digital FHR,Battery low,Voice,Ultrasound frequency,Mode typeButtonON/OFF, Voice Control, Mode ChangeAudio OutputLoudspeaker or ...