1 Use the built-in GPS to see your pace and distance on-screen during outdoor runs, rides, hikes, etc., and a workout intensity map in the app that shows your heart rate changes along your route 2 When you reach your target heart rate Feel the buzz during your workout and celebrate the extra time you gain outside of your workout 3 Get a 90-day free trial to help you stay active, sleep well and manage stress. Unlock it all in the Fitbit app. (Valid payment method required. Cancel before free trial ends to avoid subscription fees. Offer only available to new premium users) 4 Track your skin temperature nightly to see how it differs from your personal baseline (not in AVAILABLE IN ALL MARKETS. ONLY IN THE FITBIT APP, SHOW VARIATION ONLY. NOT FOR MEDICAL PURPOSES It's also water resistant to 50 meters and water resistant so you can track swimming, wear it in the shower and more for 6+ days Battery lasts up to 7 days and up to 5 hours with built-in GPS (varies with usage and other factors) . Track sleep stages and view your in-app sleep score for easy visibility into your sleepPackage List One PieceSize: 20*62mm wrist circumference 145-195mmCategory: Watches