1. Brand new and high quality
2. One twist to switch between bass and normal mode
3. Compound vibrating diaphragm wide sound field and bandwidth
4. Brushed and sand blasting finish creates metal texture
5. Phonic inner cavity recreates more natural human voice
6. High quality wire lower distortion and more durable
7. Comes with large / medium / small earmuffs
8. Wire control supports volume control playback control answer / hang up calls