Overview Featuring extremely durable construction and a folding headband for easy storage when not in use, the HD 300 is perfect for listening to music on the go. Sennheisers own transducers ensure a well-balanced sound and powerful, dynamic bass. Features Renowned Sennheiser sound quality for a unique listening experience. Closed-back around-ear headphones reduce unwanted background noise for your comfort. Lightweight, foldable headphones for easy on-the-go storage. Technical Data Impedance 18 ohm Frequency response (Headphones) 18–20,000 Hz (-10 dB) Sound pressure level (SPL) 118dB (1kHz/1Vrms) THD, total harmonic distortion < 0.5 % (1 kHz, 100 dB SPL) Ear coupling Over-Ear Jack plug 3.5mm angled Cable length 1.4m Transducer principle Dynamic Weight 182g Acoustics Closed What's in the box HD 300 around-ear headphones 3.5 mm angled plug