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  Product Features:
1.Earphone:
Type: in ear-type, mono-dynamic.
Speaker diameter: 15mm with NdFeB magnet, Thin film:9U.
Impedance: 32 ohms.
Frequency response: 100Hz~3.5kHz.
2.Microphone:
Type: omnidirectional ECM.
Frequency response: 20Hz~20kHz.
Sensitivity: 56dB±2dB.
3.Plug: 
3.5mm stereo plated, L type.
4.The length of coiLED transmission wires can be selected, the scope is from90 to 135 (cm). 
Packing information:
Packing material: white box 
Box size:9×4.5×2 (cm)
Outer size: 47×42×24 (cm)
Encasement quantity: 500pcs
G /N weight: 14.30/13.30 (kg)