The Evolve2 40 Headset and feel the noise around you instantly fade, as the isolating foam oval ear cushions and pioneering new angled ear-cup design work to effectively block out your surroundings, giving you outstanding passive noise cancellation. The headset comes with powerful leak-tolerant 40mm speakers and is powered with Jabra's advanced digital chipset. Plus, an intelligent mute switch is automatically activated when the boom arm is moved away from the mouth, for maximum ease of use and peace of mind.