Special Edition: Black Binaural Black Tubing Black Chestpiece 27 * Tunable diaphragm conveniently alternates between low and high frequency sounds without the need to turn over the chestpiece * Excellent acoustic seal and comfortable fit with patented Snap Tight soft-sealing eartips * Comfortably angled anatomically correct headset * Patient-friendly nonchill rim and diaphragm * High performance single lumen tubing * 3 year warranty