***** **********Best Quality Guranteed. *****Stainless steel bezel finish with sapphire glass*****Superior battery life with up to 24 days of regular use, 25 hours in full GPS mode and 80 hours in UltraMax GPS mode. *****Built-in Wrist-based heart rate monitor, barometer, altimeter, and compass. Water resistant up to 100 Meters/328 Feet*****Digital Knob for easy operation by allowing full control of the watch with a single finger. *****Industry leading GPS and distance tracking via GPS, GLONASS or BDS satellites and proprietary algorithms even in dense woods with direct integration with popular 3rd party training platforms like Strava, TrainingPeaks, Relive, Final Surge and Runalyze.