The MDF ER Premier is a robust and versatile stethoscope with superior acoustic quality that enables ER physicians and first responders to deliver fast and efficient emergency care to both pediatric and adult patients using just one stethoscope. Constructed from premium-grade acoustically-superior stainless steel, the MDF ER Premier Stethoscope delivers accurate auscultation of heart, lung, and Korotkoff sounds with acoustic integrity and clarity. An ergonomic design ensures comfort for the doctor and patient, even during extended use. The ER Premier is the ultimate diagnostic instrument with unmatched performance, durability, and aesthetics. With the included cardiology bell conversion, this stethoscope can be transformed into a cardiology stethoscope. Chestpiece: The handcrafted stainless steel dual-head chestpiece is precisely machined and hand polished for the highest performance and durability. Full-rotation acoustic valve stem with green indicator dot allows the user to easily identify the active sound channel. The chestpiece is fitted with an adult and pediatric ultrasensitive diaphragm, each sealed with a non-chill retaining ring to provide a secure acoustic transmission for heart and lung sounds of 100Hz to 1000Hz. The pediatric side can be converted to an extra-large cone-shaped bell crowned with a non-chill bell ring to provide greater sound amplification and isolation of low frequencies (20Hz to100 Hz). Acoustic Tubing: Constructed of thicker, denser, latex-free PVC, the dual lumen non-stick acoustic tubing ensures sound efficiency, 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. ErgonoMax Headset: Hand polished, pre-angled stainless steel binaural features 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: 2 extra sets ComfortSeal eartips, cardiology bell conversion, spare ultrasensitive diaphragm, and ID tag. Warranty and Service: Lifetime warranty (5 years on tubing); Free Replacement Parts for Life Program.