Sony MDR-DS6500 Wireless Surround Digital Headphones - 2.4 GHz - 12-22000 Hz - 3.5mm / Digital Optical/Composite Connectors - Black (Certified Refurbished) This Certified Refurbished product is tested and certified by the manufacturer or by a third-party refurbisher to look and work like new, with limited to no signs of wear. The refurbishing process includes functionality testing, inspection, reconditioning and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic white or brown box.