The HD 400S features a one-button smart remote conveniently located on the cable, which allows you to control music and take calls with ease, and the sturdy folding design makes these headphones durable and compact enough to be taken anywhere. Sennheiser dynamic drivers deliver a well-extended sound response with dynamic bass.
| Impedance | 18 Ω |
| Frequency response (Microphone) | 100 – 10,000 Hz (-10 dB) |
| Frequency response (Headphones) | 18–20,000 Hz (-10 dB) |
| Sound pressure level (SPL) | 120dB (1kHz/1Vrms) |
| THD, total harmonic distortion | <0.5% (1kHz/100dB) |
| Ear coupling | Over-Ear |
| Jack plug | 3.5mm angled |
| Cable length | 1.4m |
| Transducer principle | Dynamic |
| Weight | 217g |
| Pick-up pattern | Omni directional |
| Microphone sensitivity | -44dbV/Pa |
| Acoustics | Closed |
| Sensitivity | 120 dB SPL @ 1 kHz, 1V RMS |
