McKesson LUMEON Hand-Held Doppler Unit Obstetrical Probe 3 is used to detect the fetal heartbeat for prenatal care. It also uses the doppler effect to provide an audible simulation of the heart beat. Features: LUMEON Hand Held Doppler Unit with Display Full-display, hand-held dopplers with superior sound quality, extended battery life, enhanced probe sensitivity, interchangeable probes, and a one-year full warranty. Doppler systems are compatible with 2, 3, 4, 5 and 8 MHz probes Our systems also interface with the 5 MHz transvaginal obstetrical probe which is specifically designed to detect early fetal heart activity. Clearly shows 50 to 220 BPM heart rate, signal quality and battery life. Not Made With Natural Rubber Latex. One count