Item: HP-253 Computer Headphone

Driver Unit:Φ30mm   
Speaker Impedance:32Ω±15% 

Speaker Sensitivity:110dB±3dB
Speaker Frequency Range:20-20KHz
Mic.dimensions:Φ6*5mm
Mic. Sensitivity:-58dB±3dB                 
Input Plug Diameter:3.5mm            
Cord Length:Appr.2.2m

Packing: 1pc/clamshell, 40pcs/ctn, Size/Ctn: 72x39x38cm