Sony MDRZX110AP ZX Series Extra Bass Smartphone Headset with Mic (Black) + 3.5mm Mini Plug to 1/4 inch Headphone Adapter & HeroFiber Ultra Gentle Cleaning Cloth This kit includes 3 items; Sony MDR-ZX110AP/ 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, Neodymium dynamic drivers deliver precise sound Pair with your MP3 player, great for home, studio & with smartphones, In-line microphone for hands-free phone calling Collapsible Construction, Swivel Earcups, 1.2m/47.25" 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