Sennheiser MX 680i Adidas Sports In-Ear Headset w/ Microphone (Certified Refurbished) This Certified Refurbished product is factory refurbished, shows limited or no wear, and includes all original accessories plus a 90 day warranty Ear sleeves have been replaced and are brand new. Smart remote with mic: enhanced usability for the latest models of iPod, iPhone and iPad. EarFin holding system: secure and comfort fit during workout. Sweat and water resistant. High output drivers: energizing sound.