"A military standard watch with 12 military certificates, the Amazfit T-rex smartwatch is ideal for times when the going gets tough. Thanks to its rugged exteriors, this smartwatch can withstand tough enviroments like extreme cold (-40 F) to extreme hot weather (+150 F) to 240 hours in damp heat, etc. Use it for upto 20 hours on a single charge! It has 28nm Sony GPS chip to make sure your power consumption remains low even with continuous GPS usage for 40 hours. It comes with 1. 3” AMOLED screen with an always-on display, With 14 sport modes and 5 ATM water resistant body, the Amazfit T-Rex is perfect for outdoor enthusiasts."