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. With 14 sport modes and 5 ATM water resistant body, the Amazfit T-Rex is perfect for outdoor enthusiasts. 3 Months Warranty