The APEX Pro is COROS' most versatile watch. believeintherun Best in Gear 2019, you may have recently spied it on the wrist of a pretty big time runner. Featuring 40 hours of battery life and a pulse oximeter with automatic altitude acclimitization alerts, the APEX Pro is perfect for just about anything the trails or mountains throw at you. #exploreperfection #gpswatch #running #trailrunning