Patented tunable diaphragm on each side of chestpiece for adult, pediatric and small site auscultation. Conveniently alternate between low- and high-frequency sounds without need to turn over chestpiece. Solid stainless steel chestpece provides outstanding acoustic performance. Comfortably angled, anatomically correct headset. Excellent acoustic seal and comfortable fit with patented 3M Littmann Snap-tight, soft-sealing eartips. Patient-friendly, non-chill rim and diaphragm. Recommended as diagnostic aid and for cardiology and high-performance adult and pediatric use. Five-year warranty.