Features two-sided chestpiece and high acoustic sensitivity for superior performance. Traditional bell combines with patented tunable diaphragm that conveniently alternates between low- and high-frequency sounds without need to turn over chestpiece. 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. Three-year warranty.