IE 400 PRO earphones
| Frequency response | 6 – 19,000 Hz |
| Impedance | 16 Ω |
| Sound pressure level | 123 dB (1 kHz / 1 V rms) |
| Total harmonic distortion (THD) | < 0.08 % (1 kHz, 94 dB) |
| Noise attenuation | < 26 dB |
| Magnetic field strength | 2 mT |
| Temperature Operation: Storage: |
-5 °C to +50 °C (23 °F to 122 °F) -20 °C to +70 °C (-4 °F to 158 °F) |
| Relative humidity | < 95% |