Apple Watch Series 4 GPS, 40mm Gold Aluminum Case, Pink Sand Sport Loop: GPS Over 30% larger display (2) Electrical and optical heart sensors Digital Crown with haptic feedback 50% louder speaker (2) S4 SiP with faster 64-bit dual-core processor Improved accelerometer and gyroscope for fall detection Swimproof (3) watchOS 5 Aluminum case Selection may vary; see a sales associate for available models. Apple Watch Series 4 (GPS) requires an iPhone 5s or later with iOS 12 or later. (1) Apple Music requires a subscription (2) Compared with the previous generation (3) ISO standard 22810:2010. Appropriate for shallow-water activities like swimming. Submersion below shallow depth and high-velocity water activities not recommended.