Sennheiser MX685 Sports In-Ear Headphones - Black (Certified Refurbished) 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 resulting product includes all relevant accessories, comes with a minimum 90-day warranty, and may arrive in a generic box. Only sellers who meet a high performance bar may offer Certified Refurbished products on Amazon.com These sports afficianados listen to their headphones/headsets during their sports activities in order to motivate themselves further. Therefore these headphones/headsets have been specifically designed and tested to sound good and to stay comfortable, secure and reliable throughout the course of their activity. Perspiration and water resistant Para-aramid-reinforced cables for superior strength and durability