KM-E138 Specifications/Features The latest products fit for Nano 2 generation  1.Plug dia: 3.5mm stereo plug   2.Diaphragm thickness: 6mu   3.Impedance: 16 Ohms  4.Cable length: 120cm (standard)  5.Frequency response: 18Hz-24kHz   6.Level difference of L-R: +/- 3dB at 1,000Hz   7.Sensitivity: 118dB +/- 2dB at 1,000Hz   8.Maximum output power: 5mW   9.Maximum distortion: equal or below 1%  10.Packing: original packaging, static-proof packaging available