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By certification 
Model No.: I-MMHP002
Driver Unit: Φ40mm
Impedance: 32Ω ± 15%
Sensitivity: 109dB ± 3dB
Frequency Response: 20Hz ~ 20,000Hz
Maximum Input Power: 30mw
Mic Frequency Response: 100Hz ~ 16,000Hz
Mic Impedance: 2.2kΩ ± 10%
Mic Sensitivity: -58dB ± 3dB
Plug: Φ3.5mm
Cord Length: 2.1 m
Headphone categories: headset, multimedia headphone.
M.O.Q.: 2000 pieces / per color / design
Packing: 1pc / opp bag or bubble bag + color box, 20pcs / CTN
Lead-Time: 30-45 days