The amazfit t-rex smartwatch is your ideal outdoor companion.this smartwatch is your best bet to last extreme conditions as hot as 150f or as cold as -104f to 240 hrs in damp heat etc. with a 1.3 ”amoled screen, an always on display, a rugged body that's built to last and resist tough conditions, and a 20-day battery life, the amazfit t-rex smartwatch is the perfect smartwatch for when the going gets tough. t-rex smartwatch is designed to withstand all kinds of outdoor activities, this watch is 5 atm certified which means you can take it swimming with you! it also comes with 14-sport modes to keep up with your active lifestyle. the t-rex comes with huami's self-developed optical sensor that provides high-precision continuous heart rate tracking,