Alternates between low and high frequency sounds without the need to turn over the chestpiece * Stainless steel chestpiece * 2-in-1 tube design eliminates tube rubbing noise * Portable convenience of a single-sided chestpiece * Excellent acoustic seal and comfortable fit with patented Littmann Snap Tight soft-sealing eartips * Comfortably angled  anatomically correct headset * Patient-friendly  nonchill rim and diaphragm. Special procedures adaptor for difficult site or pediatric ausculation * Available in a selection of classic tube colors * 7 year warranty