A tunable diaphragm allows the user to conveniently alternate between the low- and high-frequency sounds without turning over the chestpiece * Portable convenience of single-sided chestpiece * High-performance  single-lumen tubing* Acoustic seal and comfortable fit with patented 3M Littmann© Snap Tight Soft-Sealing Eartips *Angled  anatomically correct headset *  32 inch (81.3cm) * Single-sided chestpiece * Navy Blue tube *   # Patient-friendly  nonchill rim and diaphragm. # Three-year warranty