Perfect conditions New 'Sofie Heart Rate' features: Heart Rate Tracking, Unthethered GPS activity tracking and NFC payments methods. Get important data at a glance: View notifications from any App or messaging system, ignore/accept calls, get the weather, track activity such as steps and calories, customize watch faces, create lists and reminders and control your music Android Users will experience additional features such as respond to texts, emails, smart replies and use voice activated Google Assistant to place calls, send texts and ask for directions. Powered with Wear OS by Google, a trademark of Google LLC. Compatible with Android OS 4.4+ (excluding Go) and iOS 9.3+. All devices have Bluetooth(R) 4.1 Low Energy and Wi Fi 802.11 b/g/n. supported features may vary between platforms Case Diameter: 42mm; Case Thickness: 11mm. Water resistant to 30m (100ft): in general, withstands splashes or brief immersion in water, but not suitable for swimming or bathing Includes all original items Books, charger, extra buckle. Box included. More pictures if requested.