Designed for the extreme adventurer, the Coros VERTIX GPS Adventure Watch takes all the APEX Pro Premium's fitness features and functionality. It takes durability to the ultimate level that showcases some astounding operating condition tolerances. As a multisport GPS sports-watch with wrist-base heart rate tracking, the VERTIX is faithful to everyday training for runs, hike, cycling, swimming, functional fitness, and other cardio sports. It guides you on structured workouts, gives feedback on running stride, overall fitness, sleep, recovery, and lets you navigate its touchscreen in map-modes to leave breadcrumbs and plot where you are on-trail. It even monitors your blood oxygen saturation to determine altitude acclimatization.But where the VERTEX reaches for the extreme limits are in its diamond-like sapphire glass screen and durable titanium alloy construction. A heavily-fortified design pushes the operating temperature of the VERTEX to a range of -4 to 140 degrees Fahrenheit, meaning there aren't that many places you can take the VERTIX and have it not record your exploits. If that wasn't enough, Coros engineers the watch to be waterproof down to 150 meters, a feat it claims makes it the only GPS watch capable of the depth. So never fear taking your watch on your next snorkeling trip.Despite all the rugged and impressive durability, the VERTIX remains easy to use and customizable to fit your needs. The main screen displays your preferred data and mapping features and works seamlessly between its touchscreen and side button/dial wheel. And when you've run out your adventures, the VERTIX charges back to life in a short two hours or less.