The Huntleigh Sonicaid FD1 and FD3 Obstetric Dopplers are optimized with a high sensitivity probe to maximize performance in a wide variety of clinical applications and procedures. The FD1 and FD3 are an an excellent choice for general prenatal exams, labor, delivery, and is a great option for water births. Additionally, the FD1/FD3 come equipped with attached 2/3Mhz waterproof high sensitivity probes that provide a visual of fetal heart rate (FHR) in large numbers on the black and white LCD screen. Furthermore, the LCD display is one of the fastest responding and most accurate on the market.