Notifications: Alarm Clock, App Alerts, Calendar Alerts, Email, Multiple Time Zones, Social Media, Text Functions: Activity Tracker, Control Your Music, Google Pay™, GPS, Heart Rate Tracking, Interchangeable Watch Band, Notifications, Personalise Your Dial, Swimproof Connectivity: Bluetooth Smart Enabled / 4.2 Low Energy Compatibility: Wear OS by Google works with phones running the latest version of Android™ (excluding Go edition and phones without Google Play Store) or iOS. Supported features may vary between platforms and countries with compatibility subject to change. Strap Material: Stainless Steel Battery Life: 1-2 days ** Based on usage** Case Size: 40 mm Dial Colour: Full-Colour Display Interchangeable Compatibility: 18 mm Operating System: Powered with Wear OS by Google Platform: VENTURE HR SMARTWATCH Processor: Qualcomm® Snapdragon™ Wear 2100 Sensors: Accelerometer, Altimeter, Ambient Light, Gyroscope, Heart Rate, Microphone, NFC, Untethered GPS Storage: 4GB Strap Width: 18 mm Water Resistance: 3 ATM Battery Type: SP382426 Battery Charge Time: Charge Time 60 min to 80%