Main Features: ● Military Standard (MIL-STD-810): 12 military certifications. ● Resist harsh environment: withstand extreme temperatures and conditions. 70°CHeat/-40° C Cold/240 hours Damp heat/96 hours salt spray acid and alkali. ● Metal buttons: Etching large metal buttons to quickly for easier operation in some outdoor conditions. ● Outer bezel made of special ink-filling technology with metal screws, distinct layers and strong texture Ensure the robustness of the device and protect the key components. ● 5 ATM water-resistance to ensure a normal use up to 50 meters water pressure. ● 20-day battery life to accompany you in the wildness. Advanced low-power chips, new circuit design, deep power management and optimization make Amazfit T-Rex more endurant. ● High-end Sony GPS chip with 40-hour Continuous working time. it can continuously track your route 40 hours,which is ideal for outdoor endurance sports such as trail running, outdoor walking or climbing. ● 1.3 inch AMOLED display,for clear and outstanding images. ● Rugged and bold appearance and body shape. ● 5 unique colors to choose from:Camo Green, Army Green, Khaki,Rock Black, Gun gray. ● A selection of 30 watch faces full of personality to choose from. ● Always-on Display: Your watch will display the date and time information anytime. ● 14 Sports Modes to meet all your needs: Outdoor running, walking, outdoor cycling, treadmill, mountaineering, trail running, treadmill, indoor cycling, elliptical trainer, freestyle, pool, (skiing, open water and triathlon will be added later). ● Built-in GPS+ GLONASS positioning chip for increased speed and accuracy. ● Activity Tracking with distance, active hours, calories and steps. ● Sweat-absorbent and comfortable silicone strap: skin-friendly comfort inner sweat-wicking design make it breathable and keep it dry and not sticky. ● Bluetooth Music Control directly from your watch while exercising without having to pull out your phone. ● BioTracker PPG optical sensor provides high-precision 24h heart rate with heart rate interval values abnormal heart rate warning. ● sleep monitoring to understand better your sleeping pattern. ● Sedentary reminders when you’ve been inactive for too long. ● Smart Notifications for incoming calls, text messages, apps, calendars,custom events. ● Easily find your Smartphone with the Find my phone function Weather forecast(5 to 7 days)+temperature warnings. Specifications:  Touch Screen: Corning gorilla 3 tempered glass anti-fingerprint coating Wristband length: 123mm(long)+78mm(short) Battery Life: Daily use: Up to 20 days. Basic watch mode: 66 days. GPS continuous working time: 40 hours. Satellite positioning: GPS + GLONASS Sensors: Bio M PPG Bio-Tracking Optical Sensor, 3-axis acceleration sensor, Geomagnetic sensor, Ambient light sensor Application: Amazfit APP