Steel headband headphone

Specification:

Steel + plastic headband Headphone with black foam ear cover ( color option)

 Model No.: DT-811

Plug: 3.5mm wired single pin, (double/ triple pins option)
Impedance: 32 ohms
Speaker: φ27mm 
Sensitivity: 100 ±3dB /mW at 1KHz
Frequency Range: 20 - 20,000Hz
Channel Balance: < 3dB
Distortion Rate: < 1%
Cable Length: 1.2m ± 10%(round cable)

Packing: Each earphone packed into sealed small plastic bag

10pcs per big plastic bag, 100pcs per carton.