This professional stethoscope with a two-sided chestpeice offers high accoustic sensitivety for superior performance. A traditional bell is combined with a diaphram allowing you to switch between the two depending on your preference. The diaphram side can be used to detect adult/child hearbeat whereas the bell shaped chestpiece can be used to detect a fetal heartbeat. Our deluxe, dual head, fetal stethoscope can be used to detect a fetal heartbeat from about 20 weeks onward. Our Stethoscopes are backed by a 5 year warranty and are completely safe for mom and baby. Siblings may also enjoy hearing thier own heartbeats!