Carry over 500 songs without carrying your phone. Store your playlists on your wrist and listen to them wirelessly during your workout. Track your heart rate with the built-in 24/7 heart rate monitor. No chest strap needed. Capture every active minute of your day. Sprints, strolls, stairs, steps. Every active minute counts. Tracking your moves all day, it all adds up to time, distance and calories burned.