Open-Box Unit = Customs-Inspected Unit. Packaging opened by customs, item unused, complete with all accessories.

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Specifications:
Impedance:
Mode 1: 31.2Ω@1kHz
Mode 2: 9.8Ω@1kHz

Sensitivity:
Mode 1: 114dB/Vrms@1kHz
Mode 2: 124dB/Vrms@1kHz

Effective Frequency Response: 20hz-20kHz (IEC60318-4)
Frequency Range: 8-40kHz (1/4' Free Field, -5dB)
THD: ＜1%@1kHz
Shell: Medical-grade resin + aluminium alloy + carbon fiber
Drivers: 10mm silicone diaphragm dynamic driver + 6mm wool paper diaphragm passive dynamic driver + 2 balanced armature drivers
Cable: Interchangeable 3.5mm/4.4mm plugs, 2pin 0.78mm oxygen-free copper braided paracord cable

What's In The Box:
Volume S * 1
Headphone cable * 1
3.5mm plug * 1
4.4mm plug * 1
Adjustment tool * 1
UC eartips * 3 pairs
B-type eartips * 3 pairs
Storage case * 1
Dust paper * 1
Portable bag * 1
User manual * 1
Brand card * 1