Item: HP-353 Computer Headphone

Driver Unit:Φ40mm   
Speaker Impedance:32Ω±15%  

Speaker Sensitivity:110dB±3dB
Speaker Frequency Range:20-20KHz
Mic.dimensions:Φ9.7*6.7mm
Mic. Sensitivity:-58dB±3dB                 
Input Plug Diameter:3.5mm            
Cord Length:Appr.2.2m

Can make both computer headphone and MP3 headphone without MIC

Packing: 1pc/clamshell,20pcs/ctn, size/ctn: 47x41x44.5cm