1.Driver:9mm neodymium magnet moving coil unit. 2.Frequency response:20~20k hz 3.Impedance:16ohms 4.Sensitivity:105db(+/-5db) 5.Plug:8pin lightning 6.Cable length:1.2m+/-15% 7.Cable jacket:tpe, flat type or round type 8.Cable cord:6n ofc 9.Earphone shell:aluminum alloy 10.Max input power of driver :5mw 11.Certification :ce, fcc, mfi Plastic bag