Heart rate tracking, smartphone notifications, NFC payments, GPS, rapid charging, touchscreen functionality, microphone and Google Assistant, music storage & controls, customizable watch faces, custom goal & alarm settings, multiple time zones Rapid charger included; estimated 24 hour battery life, based on usage; imported; swimproof Case size: 43mm; Band size: 20mm Powered with Wear OS by Google; compatible with Android OS 4.4+ (excluding Go edition) and iOS 9.3+ smartphones; Bluetooth 4.1 Low Energy and Wi-Fi 802.11 b/g/n; supported features may vary between platforms