1.headphone for PC or language lab
2.headphone MIC omhs option
3.professional high quality 
4.3.5mm or 5pin plug option

headphone main technical indexes:

1)headphone Impedance :2×16Ω; 2X32; 
2) Sensitivity : 110±3dB
3)Frequency range : 20~20000Hz
4)headphone Rated power : 2×100mW

Headphone MIC
1)headphone  Impedance : 1800Ω (200Ω dynamic)
2)  Sensitivity : -48±3dB
3)Directivity : omnidirectional
4) Frequency response : 30~16000Hz

Headset Model Number: 888 
Style: Headband 
communication: Wired 
Connectors: 3.5mm or 5 pin plug 
Use: Portable Media Player 
Function: Noise Cancelling 
headset Place of Origin: China (Mainland) 
Function: Multimedia