PRODUCT FEATURES Track steps, distance, calories burned, hourly activity and active minutes Understand your body better with advanced features like Sleep Score, 24/7 heart rate and on-screen workouts Use Amazon Alexa Built-in to get quick news and information, check the weather, set timers and alarms, control your smart home devices and more all through the sound of your voice Based on your heart rate, time asleep and restlessness, in-app Sleep Score helps you better understand your sleep quality Control Spotify With always-on display mode, your information's just a quick glance away during workouts 24/7 heart rate tracking: Get continuous heart rate tracking, follow trends over time & see real-time heart rate zones Fit in more fitness with on-screen workouts that coach you through each move and give you real-time stats on your wrist Optimize your workout routine with a Daily Readiness Score that reveals if you’re ready to exercise or should focus on recovery (requires Fitbit Premium membership)1 Seamless streamlined modern design, anodized aluminum case and silky smooth silicone band Make secure purchases right from your wrist using Fitbit Pay Get call, text, calendar and smartphone app notifications when your phone is nearby. Plus send quick replies and voice replies on Android only Water resistant to 50 meters, which means you're free to wear it in the pool, in the shower, at the beach and beyond On-wrist Sleep Score. Smart Wake. Expanded always-on clock faces.