Notifications: Alarm Clock - App Alerts - Calendar Alerts - Email - Multiple Time Zones - Social Media - Text. Functions: Activity Tracker - Challenge Friends to a Workout - Control Your Music - Customizable Buttons - Heart Rate Tracking - Interchangeable Watch Band - Notifications - Personalize Your Dial - Visualized Workout Routes. Connectivity: Bluetooth 5.0 LE. Compatibility: Fossil Smartwatches work with phones running the latest version of Android or iOS. Supported features may vary between countries with compatibility subject to change. Strap Material: Leather. Battery Life: 2 Weeks - Based on usage. Case Size: 45MM. Case Color: Silver. Dial Color: Green - Negative Display. Interchangeable Compatibility: 22MM. Operating System: Fossil Smartwatch (Hybrid App). Platform: NEUTRA HYBRID HR SMARTWATCH. Sensors: Accelerometer - Heart Rate. Storage: 16MB. Strap Width: 22MM. Water Resistance: 3 ATM. Battery Type: SP380922SE. Battery Charge Time: Charge Time 60 min to 80%.