Outstanding acoustics combined with a unique and easy-to-grasp chestpiece allow easy movement between auscultation sites. The Littmann Cardiology S.T.C. stethoscope's innovative design allows easy movement and handling by the healthcare provider while still providing outstanding acoustics. The tunable diaphragm allows the user to conveniently alternate between low- and high-frequency sounds by applying a simple pressure on the chestpiece. Dual-lumen design helps eliminate noise artifact. Comfortably angled, anatomically correct headset with patented Snap Tight soft-sealing ear tips. Patient-friendly, nonchill rim and diaphragm. Six-year warranty.