Apple Watch Sport 42mm Gold Aluminum Case with Midnight Blue 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. System on a chip: Apple S1 Sport Band with stainless steel pin; Digital Crown Heart rate sensor, accelerometer and gyroscope; Ambient light sensor Retina display with Force Touch; Composite back, Splash and Water resistant in rain, exercising, etc (but not to be submerged in water, as it's not waterproof!)