Overview Take on demanding runs, climbs and mountain adventures with the COROS APEX 4 GPS Sports Watch – 46mm Black . Built for mountain athletes, the APEX 4 combines dual-frequency GPS, detailed global maps, a sapphire touchscreen and Grade 5 titanium bezel in a durable, lightweight design. Its long-lasting battery provides up to 65 hours in Endurance Satellite Mode , while advanced training, recovery and navigation tools help you track performance both during and after your activities. Key Features & Benefits Precise Dual-Frequency GPS Advanced satellite positioning and vertical GPS algorithms are designed to maintain accurate tracking in challenging environments such as forests, valleys and steep mountain terrain. Up to 65 Hours GPS Battery The 46mm APEX 4 provides up to 65 hours in COROS's Endurance Satellite Mode, making it suitable for long-distance races and extended outdoor adventures. 1.3-Inch Always-On Display The third-generation Memory-in-Pixel touchscreen is designed to remain easy to read in bright sunlight, snow and shaded environments. Scratch-Resistant Sapphire Glass Sapphire glass provides excellent resistance against everyday scratches during demanding outdoor use. Grade 5 Titanium Bezel The lightweight titanium bezel provides extra durability without adding unnecessary weight. Detailed Global Maps View landscape and topographic maps directly on the watch, complete with street names, trail names and points of interest. Turn-by-Turn Navigation Follow routes with turn-by-turn guidance and use features such as Back to Start to help stay on course. Dual-Range Barometer Enhanced altitude and pressure tracking helps provide more accurate elevation information during steep climbs and rapidly changing mountain conditions. Advanced Heart-Rate Tracking Monitor heart rate throughout workouts and daily activity to help understand training intensity and recovery. SpO2 Monitoring Track blood oxygen saturation with the built-in optical pulse oximeter as part of supported wellness and altitude features.