Renowned Sennheiser sound quality for a unique listening experience Built-in microphone and remote for call and music control Closed-back around-ear headphones reduce unwanted background noise for your comfort Lightweight, foldable headphones for easy on-the-go storage Impedance: 18 Ω ; Frequency response (Microphone): 100 – 10,000 Hz (-10 dB) ; Frequency response (Headphones): 18–20,000 Hz (-10 dB) ; Jack plug: 3.5mm