The Amazfit Active 3 Premium features a stainless steel build, a ultra-bright 3,000-nit sapphire AMOLED screen, and offline map navigation tailored for running and hybrid fitness training. 📐 Design & Build Dimensions: 45 x 45 x 11 mm Weight: 38 grams (without strap) Case Material: Stainless steel frame Water Resistance: 5 ATM (up to 50 meters, suitable for swimming) 📺 Display Screen Type: AMOLED Touchscreen Size: 1.32 inches Resolution: 466 x 466 pixels (353 PPI pixel density) Protection: Sapphire glass Peak Brightness: Up to 3,000 nits Always-On Display: Yes 🔋 Battery & Power Capacity: 365 mAh Typical Usage: Up to 12 days Heavy Usage: Up to 7 days Always-On Mode: Up to 4 days Continuous GPS Mode: Up to 24 hours GPS Power Saving Mode: Up to 76 hours GPS with Music Playback: Up to 10 hours 🛰️ Connectivity & Positioning Bluetooth: Version 5.3 BLE Satellite Positioning: Single-band GPS with 5 Satellite Positioning Systems Navigation: Free Offline Maps and Turn-by-Turn navigation Hardware: Built-in Microphone and Speaker for Bluetooth Calling 🩺 Sensors & Health Tracking Optical Sensor: BioTracker PPG (5 Photo-Diodes + 2 LEDs) Movement Sensors: Accelerometer, Gyroscope, Geomagnetic sensor Environmental Sensors: Barometric Altimeter, Temperature sensor Metrics Tracked: Continuous Heart Rate, Blood Oxygen (SpO₂), Stress levels, Skin Temperature, Sleep metrics (including Heart Rate Variability), and BioCharge™ 🏋️♂️ Smart Features & Software Operating System: Zepp OS Internal Storage: 4GB (supports standalone music player storage) NFC Payments: Supported via Zepp Pay Sports Modes: 170+ tracking activities with advanced running metrics External Connections: Supports pairing with Bluetooth heart rate chest straps and cycling/running power meters Data Sync Compatibility: Strava, TrainingPeaks, Adidas Running, Runkeeper, Apple Health, and Google Fit Device Compatibility: Android 7.0 or higher, iOS 14.0 or higher