Aluminum Chassis with Ion-X Glass1.65" 390 x 312 1000-Nit DisplayActivity and Heart Rate MonitoringChangeable Faces with WidgetsSiri IntegrationDisplays Notifications and Runs AppsWater Resistant to 164'Integrated GPS3G LTEBluetooth 4.2, 802.11b/g/n Wi-FiApple watchOS 4.0