USB headphone

Description:
1.Sensitivity at 1KHz : 105+/-3 dB;
2.Impedance : 32+/-15% Ohm;
3.Speaker dia : à40mm;
4.Mylar : 12µ;
5.Frequency response : 130-20000Hz;
6.Input power : Nom40mw,Max100mw;
7.Distortion : Less than 3% at 1KHz 40mw;
8.Weight : Approx 205+/-3 grams;
9.connector : USB2.0;
10.Cord length :250 cm;
11.color:Gray & black.
12.Packing detail:
Out carton Means54*32*39cm
inner carton means30*25*35.5cm
QTY80PCS
Net16.0KG
Grow20.0KG
One giftbox for a headset.
13. 5.1 SR.