Perfect watch for a runner, biker, hiker -- anyone with an active lifestyle! Special Features: Bluetooth Connectivity, Heart Rate Monitoring, Shock Resistant, Barometric Altimeter, Activity Tracker, GPS, Water Resistant, 14-day Battery About: - Rugged GPS watch built to withstand the toughest environments. - Constructed to U.S. Military standard 810G for thermal, shock and water resistance (rated to 100 meters) - Built in 3 axis compass and barometric altimeter, plus multiple global navigation satellite systems (GPS, Glonass and Galileo) support helps track in more challenging environments than GPS alone - Monitor your estimated heart rate, activity and stress; Train with preloaded activity profiles. Strap material: Silicone - Stay connected with smart notifications (with a compatible smartphone) and automatic data uploads to the Garmin connect online fitness community - Use the trackback feature to navigate the same route back to your starting point; Use the Garmin explore website and app to plan your trips in advance - Battery life: Up to 14 days in smartwatch mode, up to 16 hours in GPS mode, up to 40 hours in Ultratrac battery saver mode - Screen Size: 1.27 Inches (Garmin Instinct, Rugged Outdoor Watch with GPS, Features Glonass and Galileo, Heart Rate Monitoring and 3-Axis Compass, Graphite)