About this item RUGGED DURABILITY: Amazfit T-Rex Pro smartwatch is military-grade certified for rugged and demanding environments and is built to resist high heat, humidity, and extreme cold. LONG 18-DAY BATTERY: Up to 18 days on a single charge for more running, hiking, walking, and being active without worrying about battery life. CUSTOMIZABLE TOUCHSCREEN: Ultra-durable glass AMOLED face with 34 alternative watch face choices. HEART-RATE and VO2 MONITORING: Find your cardio zone with heart-rate monitoring and blood-oxygen saturation measurement. FITNESS APP DATA SHARING: Easily connect with Strava, Adidas Running, Apple Health, Google Fit, Relive, Komoot to record and share health,…