PRODUCT DETAILS Activity Tracking: Built In Fitness Tracker Notifications: Text / Email / Social Media / App Alerts / Multiple Time Zones / Alarm Clock / Calendar Alerts Functions: Heart Rate Tracking / GPS / Google Pay™ / Swimproof / Notifications / Personalize Your Dial / Control Your Music / Interchangeable Watch Band Connectivity: Bluetooth® Smart Enabled / 4.1 Low Energy, Wi-Fi 802.11 b/g/n Compatibility: Android OS 4.4+ (EXCLUDING GO EDITION), iOS 9.3+