Cresyn CS-HP500W Hi-Fi Stereo Over-Ear Headphones with Fold Down Design For Easy Storage (White) Perfect companion for your iPod, MP3 player, laptop, portable DVD player, MD player, Radio, and other audio devices. The included 6.3mm universal adapter enables an even larger scope of compatibility with high-end audio equipment. Closed, dynamic headphones provides you with a high-intensity listening experience with dynamic sound and powerful bass. Plush earpads provide secure, extremely comfortable fit, while adjustable headband provides convenient, foldable mechanic for easy storage 4.5 feet of tangle-free cord easily stores away in included carrying pouch for convenient storage. Technical Details Type: Open Air, dynamic Driver Units:  16 mm Frequency Range: 12 - 22,000 Hz Impedance: 32  Sensitivity: 98 dB/mW