Sennheiser  Remanufactured HD-497  Supra-Aural Dynamic Stereo Headphones (Silver) Over-the-ear, supra-aural dynamic hi-fi stereo headphones for home or on-the-go use Open ear design eliminates unwanted resonance to ensure warm, natural, detailed sound 24 Hz to 22 kHz frequency response; highly conductive oxygen-free copper (OFC) cable Detachable cord for easy replacement; includes 1/4-inch stereo adapter, weighs 0.29 pounds Remanufactured to like-new condition; 90-day warranty