Watch Amazfit T-Rex 3 Onyx

The Amazfit T-Rex 3 Onyx is a rugged smartwatch designed for outdoor enthusiasts and active users. It combines a durable enclosure with a large AMOLED display, long battery life and comprehensive fitness tracking. The device supports built-in GPS, continuous heart rate monitoring and more than 150 sports modes. Water resistance to 100 meters and 15 military-grade certifications provide enhanced durability for demanding environments.

Advantages

The watch offers extended battery life of up to 18 days in typical use, reducing the need for frequent charging during long trips. The bright AMOLED screen ensures readable information even in strong sunlight, while the robust construction and military-grade certifications improve resistance to shocks, temperature extremes and moisture. Integrated GPS and advanced health sensors deliver accurate activity tracking and heart rate data across a wide range of sports modes.

Suitable for

• Hiking, trekking and mountaineering
• Trail running and road running
• Swimming, snorkeling and recreational diving
• Everyday fitness tracking and sleep monitoring
• Long-distance travel and multi-day adventures

Key specifications

• Display: AMOLED, high-brightness for outdoor visibility
• Battery life: up to 18 days in typical use
• Durability: rugged housing with 15 military-grade certifications
• Water resistance: rated to 100 meters suitable for swimming and diving
• Navigation: built-in GPS for outdoor tracking and route logging
• Health tracking: continuous heart rate monitoring and activity detection
• Sports modes: more than 150 preloaded exercise profiles

How to use

Charge the watch fully before first use, then pair it with your smartphone using the companion app to enable GPS syncing, activity history and notifications. Use the touchscreen and physical controls to start exercise modes, view real-time metrics and access navigation features. Wear the device snugly on the wrist during workouts to ensure accurate heart rate and motion measurements. After outdoor activities, sync recorded routes and health data to the app for analysis and backup.

Usage recommendations

For reliable measurements, wear the Amazfit T-Rex 3 Onyx on the wrist above the ulna with a comfortable, firm fit. Rinse and dry the watch after exposure to saltwater and avoid pressing buttons underwater unless the manufacturer’s instructions indicate it is safe. Enable power-saving modes during long trips to extend battery life, and regularly update firmware through the companion app to maintain GPS and sensor performance.