SONY Professional Monitor Headphones Brand new, unused item. I opened the package for the purpose of listing it. Thank you. Model Number MDR-CD900ST Type Closed-back dynamic Driver Unit 40mm dome type (CCAW adopted) Maximum Input 1,000mW Impedance 63Ω Sound Pressure Sensitivity 106dB/mW Frequency Response 5～30,000Hz Cord Length 2.5m Cord Thickness Φ4.0mm Plug Stereo standard plug Weight: Approximately 200g (excluding cord) Thank you for viewing.