Amazfit T-Rex Pro Black Outdoor Fitness Watch for Men. Explore your instinct with this military standard certified smartwatch featuring 70°C heat-resistance, -40°C cold-resistance, 240h humidity-resistance, 96h salt spray resistance, ice, freezing rain and shock resistance. 1.3" HD AMOLED color screen with always-on display accompanied by a sweat-wicking silicone strap. T-Rex Pro supports up to four Global Navigation Satellite Systems, 10 ATM water-resistance, a blood-oxygen saturation measurement system, a weather tracker, a sunrise and sunset monitor, a current moon phase display, a compass and barometric altimeter, ultra-long 18-day battery life6 with typical use, and over 100 different sports modes. The smartwatch can also notify text messages or calls, schedule alarms and events, and control music playback via Bluetooth; enjoy your favorite songs on-the-go. Smartwatch Tracker Features