BrandAmazfitWifiWi-Fi 2.4GHzBluetoothBluetooth 5.2, BLEApp SupportZepp App (Android 7.0+ / iOS 15.0+)ModelBalance 2Resolution480 x 480Display1.5" AMOLED, 2000 nits, 323 PPI, Sapphire GlassSweat & Water Resistance10 ATM (Swimming & High-pressure Water Activities)Features170+ Sport Modes with Smart Recognition, Zepp Coach, PeakBeats, PAI System | Bluetooth call, quick reply (Android), SMS/App/call notifications | Jet Lag Manager, Sedentary Reminder, To-Do List, Events, Camera (iOS only), Find My Phone, Voice Memo, Conditional Pause, App Notification, Smart trajectory, Virtual pacer, Track Run, etc.Battery InfoCapacity: 658 mAh (rated value) | Typical Use: Up to 21 days | Heavy Use: Up to 10 days | Accurate GPS Mode: Up to 33 hours | Power Saving GPS Mode: Up to 67 hoursSensorsAccelerometer, Gyroscope, Barometric, Ambient Light, GeomagneticOther FeaturesBioTracker 6.0 PPG (5PD + 2LED) | Smart Assistant: Zepp Flow AI (in select regions) | 3rd Party Sync: Strava, adidas Running, Google Fit, Apple Health, etc. 