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