Description: 1.Sensitivity at 1KHz : 105+/-3 dB; 2.Impedance : 32+/-15% Ohm; 3.Speaker dia : 40mm; 4.Mylar 12? 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 Means 54*32*39cm inner carton means:30*25*35.5cm QTY:60PCS Net:12.0KG Grow:16.0KG One giftbox for a headset. 13.5.1 SR.