Sony MDR7506 Headphones Features The standard headset used by professionals in motion picture entertainment use large diaphragm foldable headphones. Headphones features include: rugged design, folding construction, 40mm driver unit, closed ear design, gold connectors and oxygen free cord, frequency response (10Hz to 20kHz). Technical Specifications: - Rugged Design - Proven to be reliable in the toughest situation - Folding Construction - Compactness in storage - 40mm Driver Unit - For clear, high quality sound reproduction - Closed-Ear Design- Comfort and reduction for external noise interference - Stereo Unimatch Plug - 1/4 in. and 1/8 in. applications - Gold Connectors and OFC Cord - Reliable and stable signal connection and transmission  - Supplied soft Case - Protective storage