Apple Watch WiFi 42mm Stainless Steel Case - Black Sport Band (Refurbished) This Certified Refurbished product has been tested and certified to work and look like new, with minimal to no signs of wear, by a specialized third-party seller approved by Amazon. The product is backed by a minimum 90-day warranty, and may arrive in a generic brown or white box. Accessories may be generic and not directly from the manufacturer. Digital Crown;Heart rate sensor, accelerometer, and gyroscope Stainless steel or space black stainless steel case Sapphire crystal;Retina display with Force Touch;Ceramic back Bluetooth 4.0;Up to 18 hours of battery life;Water resistant