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 easy movements between auscultation sites. Features an attractive chestpiece that is easy to grasp in multiple hand positions, single sided chestpiece that provides bell and diaphragm frequency responses, a dual lumen design to help eliminate noise artifact, and a six-year warranty.