1.Headphone pallet rotate by 90 degree
2.steel band is more stable.
3.convient on/off switch with adjustable volume control bring you a clear and   perfect enjoyment of music.
4.LED power indicator light
5. Active Cancellation:15dB-20dB
6. reuires one  AAA battery.

Speaker   
O.D.:30mm   
Impedance: 32Ω   
Frequency Response: 20Hz-20,000Hz   
Sensitivity: 115dB±2dB   
Maximum output power:80mw   
Microphone    
O.D.:6x5mm   
Impeadance:2.2KΩ   
Frequency Response: 30Hz-15,000Hz   
Sensitivity: 54dB±2dB   
Cable Length: Approx. 2.5m