World class sound, with breath-resistant microphone, ultra noise cancellation that eliminates background noise, and HD voice and HiFi sound deliver superior sounding calls and music Best-in-class, durable build, with reinforced cord and larger ear cushions for passive noise protection Programmable buttons enable applications such as Push-to-Talk 40% lighter than competitors, soft pouch leatherette ear cushions, headphone padding and 360-degree flexible spin boom arm for ultimate comfort Optimized for use with all leading UC platforms