This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com Open studio reference class headphones for mixing and mastering, Made in Germany 250 ohms, 45 mm dynamic Tesla neodymium drivers Single sided, detachable cable with mini-XLR connectors Soft, replaceable ear pads and headband for long studio sessions. Headphone frequency response : 5-40,000 Hz. Nominal sound pressure level : 102 dBSPL (1mW/500Hz) Open-back Circumaural Headphones with 45mm Drivers, 2 Sets of Earpads, Detachable Cable, and Carry Case