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