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Sennheiser HD 400S - Over Ear Headphones with Mic and Remote Enjoy premium Sennheiser sound quality and effortless call control with the lightweight, foldable HD 400S over-ear headphones. Designed for business conferencing and on-the-go use, these headphones feature a built-in microphone and one-button smart remote for seamless music and call management. Key Features Renowned Sennheiser sound quality for a unique listening experience Built-in microphone and one-button remote for easy call and music control Closed-back, around-ear design reduces unwanted background noise Lightweight and foldable for convenient portability and storage Specifications Impedance: 18 Ω Frequency Response (Headphones): 18 – 20,000 Hz (-10 dB) Frequency Response (Microphone): 100 – 10,000 Hz (-10 dB) Sound Pressure Level (SPL): 120 dB (1 kHz/1 Vrms) Total Harmonic Distortion (THD): Ear Coupling: Over-Ear Jack Plug: 3.5 mm angled Cable Length: 1.4 m Transducer Principle: Dynamic Weight: 217 g Microphone Pick-up Pattern: Omnidirectional Microphone Sensitivity: 44 dBV/Pa Acoustics: Closed Sensitivity: 120 dB SPL @ 1 kHz, 1 V RMS What's in the Box Sennheiser HD 400S around-ear headphones RCS 400 detachable single-sided cable with 1-button remote and 3.5 mm angled plug