Stand out features Bios TrackerThe self-developed 6PD BioTracker 3.0 PPG optical sensor provides fast and accurate 24/7 monitoring of heart rate blood oxygen and stress levels. OxygenBeatsBefore you start your climb set the watch to alert you when it detects that you experience major altitude changes and it will prompt you to perform a manual spO level test. PAI ActivityPersonal Activity Intelligence uses algorithms to convert your health data into a single intuitive score for you to understand your physical state. Sleep Quality MonitoringThe watch offers in-depth sleep monitoring to accurately determine sleep stages monitors sleep breathing providing an analysis and improvement suggestions. Key features 1.39 Screen24/7 Heart Rate MonitoringBlood Oxygen MonitoringSleep Tracking Anti-Fingerprint CoatingUltra Long Battery Life Super-toughExperience the thrill of the hunt with the absolute titan of toughness that is the Amazfit T-Rex 2. The watch has passed 15 military-grade tests1 to prove it can be right there with you in the heat of the moment on your trails through humid rainforests up mountains or down in icy temperatures.Rugged StyleThe bold and trendsetting look of the Amazfit T-Rex 2 is inspired by the spirit of nature. The HD AMOLED display is as clear as the purest ocean and lets you reflect the wonders of the wilderness or the untamable urban jungle through dozens of watch faces with matching always-on displays2. Download your favorite from the Zepp App or even upload a unique image that means something special to you. Ready For ActionWith a large screen that makes it easier to the data you need. The watch's matte finish and metal-sprayed outer bezel are also complemented by a silicone strap that keeps the watch dry and comfortable.Dual-band and; 5 Satellite PositioningGo beyond adventure with the watch's dual-band positioning and support for five satellite positioning systems which can effectively reduce environmental interference and achieve more precise positioning5. Hikers climbers and explorers of any fashion can also conquer new heights and discover new paths with the T-Rex 2's built-in compass and barometric altimeter. Go Wild With 150+ Built-in Sports ModesWith a selection of over 150 sports modes including the toughness-testing Triathlon mode the professional lap-data recording Track Run mode with smart trajectory correction and the more leisurely Golf Swing mode. Whatever activity gets you going you'll find a mode for it on the T-Rex 2.10 ATM Water-resistanceThe watch has a water-resistance grade of 10 ATM meaning it can withstand the equivalent of 100 meters' water pressure. Brave the rain rule the pool and conquer the ocean with the Amazfit T-Rex 2.   .   .   Extended Battery LifeWith a battery powerful enough to enduce adventures up to 24 days at a time with typical usage the Amazfit T-Rex 2 is full of energy to get though. Compatible with the Zepp AppThrough connection to the newly upgraded Zepp App the watch enables comprehensive analysis of multiple data sources to provide 24/7 management of body data helping the user check their physical condition at any time. Some main functions include health- and exercise-data display and analysis along with smart device management.