Overview Extremely lightweight and compact, the HD 100 can be folded together when not in use. Sennheiser sound quality delivers a thoroughly satisfying listening experience with a powerful bass response and ambient noise reduction. Features Lightweight, foldable headphones for easy on-the-go storage. Closed-back on-ear headphones reduce unwanted background noise for your comfort. Tough and tangle-free cable for long-lasting listening enjoyment. Technical Data Impedance 26 ohm Frequency response (Headphones) 18–18,000 Hz (-10 dB) Sound pressure level (SPL) 110 dB SPL @ 1 kHz, 1V RMS THD, total harmonic distortion < 0.5 % (1 kHz, 100 dB SPL) Ear coupling On-Ear Jack plug 3.5mm angled plug Cable length 1.4 m Transducer principle Dynamic Weight 113g Acoustics Closed What's in the box HD100 On-Ear Foldable Headphones