【TOUGHNESS FROM THE INSIDE OUT】The Amazfit T-Rex Pro comes with a 1.3" HD AMOLED always-on color screen; The outer bezel undergoes a metal-spraying process, which enhances the rich textures of the light 60g watch body. Having passed 15 military-grade tests1, this smart watch can battle with you through hot deserts, humid rainforest and polar glaciers. Witness endurance that braves the elements with ease..Supported Application:Alarm,Calendar,Calorie Tracker,Heart Rate Monitor,Distance Tracking. Connectivity technology:GPS. Wireless comm standard:Bluetooth