Over-ear Design: Provides high wearing comfort for long working sessions | Semi-open Technology: For solid bass and clear highs | Patented Varimotion 30mm XXL transsducer: for accurate signal transfer and great dynamic range</br>Self-adjusting headband: For optimum fit | Single sided cable: for ease of use</br>Technical Specifications: Circumaural, Semi-Open, Dynamic | Frequency Range 15Hz - 25kHz | Impedance 55 Ohms</br>Sensitivity 91dB/mW (104dB/V) | Maximum Input Power 200mW | 9.8 ft (3m) Oxygen Free cable | Weight 8.5 oz (240g) (Without Cable)</br>Main Connection: 3.5m gold-plate jack plug wotj 6.3mm screw pm ada[ter</br></br>Product Description</br></br>Pro Stylist Professional Large Diaphragm DJ Semi-Open High Definition Over-Ear Studio Headphones</br><br/>http://www.amazon.com/gp/product/B0155DGHUI