The HD 218 is targeted towards cool and trendy young adults, students and professionals who regard music as part of their lifestyle. They offer a rich sound stage and stylish design. Sennheiser brings high-quality audio within reach of the average but discerning music lover. Optimized for iPod, iPhone, MP3 and CD players Connector - 3.5 mm (1/8) straight plug Cable Length - 4.6 feet Ear Cup - supra aural Pads - soft vinyl Frequency Response - 19-21,000 Hz Sensitivity (@ 1k Hz) - 108 THD - <0.5% (1 kHz/100 dB) Impedance - 24 Ohm Transducer Principle - Dynamic, closed Sound pressure level (1 kHz, 1 V rms) - 108 dB (1 kHz/1 V rms) Weight - 3.6 oz Manufacturer"s 2-year warranty