1. Bluetooth headphone, wireless music
2. Metal shell, fashion design
3. stereo sound quality, rich bass
4. Aux-in is workable, when battery is out of power
4. Soft earmuff, comfortable experience
5. Volume control, music choice, pause and play
6. Built-in Microphone for handsfree
7. Line-in function NFC function for option, cost $0.5/pc