Fit for performance with rugged, sophisticated design that features an always-on 1.2 inches sunlight-readable display with bezels in stainless steel, titanium or diamond-like carbon (DLC) coating Enhanced estimated wrist heart rate and Pulse Ox to support advanced sleep monitoring and altitude acclimation at high elevations (this is not a medical device and is not intended for use in the diagnosis or monitoring of any medical condition) Advanced training features include PacePro for grade-adjusted pace guidance throughout your activity plus environmentally adjusted VO2 max and training status estimates.Display resolution:240 x 240 pixels Navigate the outdoors with preloaded TOPO maps, ski maps for over 2,000 worldwide ski resorts, multiple global navigation satellite system (GPS, GLONASS and Galileo) support and built-in sensors for 3-axis compass, gyroscope and barometric altimeter Battery performance is up to 9 days in smart Watch mode, up to 6 hours in GPS and music mode, up to 20 days in expedition GPS activity mode, and up to 34 days in battery saver Watch mode