Sony MDRZX110 ZX Series Stereo Headphones (Black) with 3.5mm Mini Plug to 1/4 inch Headphone Adapter & HeroFiber&reg; Ultra Gentle Cleaning Cloth This kit includes 3 items; Sony MDR-ZX110 black headphones, 3.5mm mini plug to 1/4" inch headphone adapter & HeroFiber Ultra Gentle Cleaning Cloth High quality and powerful sound, Closed-Back Design, Thick On-Ear Cushions Pair with your MP3 player, great for home or studio Collapsible Construction, Swivel Earcups, 1.2m cable (both-sided) Driver Unit: Closed supra-aural, Dynamic 30 mm, dome type (CCAW Voice Coil), Frequency Response: 12 - 22,000 Hz, Impedance: 24 ohms at 1 kHz, Sensitivity (db): 100 dB/mW, Power Handling Capacity: 1000 mW