Sennheiser HD429S Over-Ear Headphones for Smartphones and Tablets - 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 Single-sided cable with integrated mic for use with smart phones and tablets Closed circumaural headphone design isolate against ambient noise Ergonomic design provides a comfortable fit great for long listening sessions High-output neodymium magnets deliver powerful bass and an overall smooth frequency response