GPS + Cellular3 Always-On Retina display30% larger screen4 Swimproof5 ECG app2 Electrical and optical heart sensorsBuilt-in compass Elevation Emergency SOS6 International emergency calling1Fall detectionwatchOS 6 with Activity trends, cycle tracking, hearing health innovations, and the App Store on your wrist Aluminum or stainless steel case Selection may vary; see a sales associate for available models. Some bands are sold separately. Apple Watch Series 5 requires an iPhone 6s or later with iOS 13 or later. 1The international emergency calling feature requires an Apple Watch Series 5 (GPS + Cellular) model. For a list of supported countries and regions see apple.com/watchos/feature-availability. 2The ECG app is available with the latest versions of iOS and watchOS on Apple Watch Series 4 or later. See apple.com/watch for compatibility details. The ECG app is not intended for use by people under 22 years old. 3Wireless service plan required for cellular service. Apple Watch and iPhone service provider must be the same. Not all service providers support enterprise accounts; check with your employer and service provider. Roaming is not available outside your carrier network coverage area. Contact your service provider for more details. 4Compared with Apple Watch Series 3. 5ISO standard 22810:2010. Appropriate for shallow-water activities like swimming. Submersion below shallow depth and high-velocity water activities not recommended. 6Apple Watch Series 5 (GPS + Cellular) and Apple Watch Series 3 (GPS + Cellular) can use a cellular connection for Emergency SOS. To use Emergency SOS on an Apple Watch without cellular, your iPhone needs to be nearby. If your iPhone isn?t nearby, your Apple Watch needs to be connected to a known Wi-Fi network and you must set up Wi-Fi Calling.