The precision of the Littmann Cardiology S.T.C. Stethoscope begins with innovative design technology. Outstanding acoustics are combined with a unique and easy to grasp chestpiece that allows comfortable movement between auscultation sites. - Unique teardrop shaped single-sided chestpiece provides both bell and diaphragm frequency responses - Outstanding acoustics with excellent low-frequency responses - Attractive chestpiece is easy and comfortable to grasp in multiple hand positions - Dual lumen design helps to eliminate noise artifact - Excellent acoustic seal and comfortable fit with patented 3M Littmann Snap Tight Soft-Sealing Eartips - Comfortably angled, anatomically correct headset - Patient-friendly, nonchill rim - Six-year warranty