Do you hear what I hear? Medical instructors no longer need to describe heart and lung sounds to students. With the MDF Pulse Time Teaching Stethoscope, instructor and students listen to the same source of sound, enabling multi-functional teaching applications in all clinical and educational settings. Chestpiece: This innovative, patented Pulse Time chestpiece with a quadruple output is equipped with a 24-hour liquid crystal analog (LCA) quartz timepiece. The advanced chestpiece is made of lightweight anodized aluminum and fitted with a unique raised ultra-thin fiber diaphragm for greater amplification and transmission of heart and lung sounds. Acoustic Tubing: Constructed of thicker, denser, latex-free PVC, the non-stick acoustic tubing provides insulation for superior sound transmission and seals out ambient noise while preventing the cracking and wearing that can occur from repeated use. The longer-than-average length allows a comfortable space between health professional and patient. Headsets: Three adjustable AccuFit student headsets constructed from chrome-plated brass allow the users to create individualized fits. One ErgonoMax instructor headset features a hand polished, pre-angled chrome-plated brass binaural with a patented internal dual-leaf spring construction for durability and custom fit. Soft ComfortSeal eartips are clear for hygienic purposes and conform to the ear to seal out extraneous noise while ensuring comfort during extended use. Force-fit, non-threaded SafetyLock eartip adaptors lead the industry in user safety. Included Accessories: Nylon zippered carrying case with Velcro side pocket, 2 extra sets ComfortSeal eartips, 2 spare ultrasensitive diaphragms, and ID tag. Warranty and Service: Lifetime warranty (5 years on tubing and timing mechanism); Free Replacement Parts for Life Program.