Dynamic closed back headphones with closed back drivers</br>Straight stereo 1/8" (3.5 mm) gold-plated with screw-on 1/4" (6.3 mm) gold-plated adapter</br>IncrediFlex?padded?? fully adjustable headband; foldable for storage</br>Environmentally responsible natural passive isolation - no batteries required</br></br>Product Description</br></br>To perform your best?? you need to hear your best. That??s why we designed the EX-29 headphones with 29 dB of passive isolation. To help you keep the outside world out ? and your music in?? in all its purity. And to stand up to studio- and performance-level extremes. No batteries required.</br><br/>http://www.amazon.com/gp/product/B0002GZLY2