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Ge t continuous, automatic, wrist-based heart rate and simplified heart rate zones Automatically recognizes when you exercise & records it in the Fitbit app Track workouts, heart rate, distance, calories burned, floors climbed, active minutes & steps Monitor your sleep automatically & set a silent alarm See daily stats & time of day, and get call notifications with compatible devices Sync stats wirelessly & automatically to leading smartphones and computers Record workouts to get real-time stats & see post-workout summaries Lasts longer than competing trackers with a battery life up to 5 days Let your heart be your guide with Charge HR. Monitor heart rate automatically and continuously right on your wrist to accurately track calorie burn, maintain workout intensity, maximize training and optimize health—all without an uncomfortable chest strap.Let your heart be your guide with Charge HR. Monitor heart rate automatically and continuously right on your wrist to accurately track calorie burn, maintain workout intensity, maximize training and optimize health—all without an uncomfortable chest strap. Let your heart be your guide with Charge HR. Monitor heart rate automatically and continuously right on your wrist to accurately track calorie burn, maintain workout intensity, maximize training and optimize health—all without an uncomfortable chest strap. Take control of your goals by using Charge HR to record your workouts and track all-day activity like heart rate, steps, distance, calories burned, stairs climbed and active minutes. With an impressive battery life up to 5 days and instant access to every stat, you don't have to look far for motivation to keep moving. With a comfortable fit and Caller ID, ChargeHR lets you stay connected in style. See incoming call notifications on display when your phone is nearby to stay in the know, on the go. View compatible devices Get credit for workouts without pressing a button thanks to SmartTrack—a feature that automatically recognizes and records select exercises. For even more precise tracking during workouts and real-time stats on your wrist, put Fitbit Charge HR into Exercise Mode. Then see how all your effort adds up by reviewing exercise summaries in the Fitbit app. Get a better picture of your overall health by using Charge HR to automatically track how long and how well you sleep. Sync your nightly stats to see online graphs that illustrate your sleep trends, and wake peacefully by setting a silent, vibrating alarm. Charge HR automatically and wirelessly syncs your stats to your computer and 150+ leading smartphones, and tracks your progress in detailed charts and graphs that keep you encouraged to reach your fitness goals. App Specifications See your progress and analyze your trends with easy-to-read charts and graphs Get details of each workout, set exercise goals & track progress over time Invite friends and family to share stats, send cheers & taunts, & compete on the leaderboard Log food fast with a barcode scanner, calorie estimator, meal shortcuts & expanded food database Get goal progress notifications & celebrate fitness milestones with badges Set sleep goals, review sleep quality & see weekly sleep trend graphs Sensors & Components Optical heart rate monitor 3-axis accelerometer Altimeter Vibration motor Display OLED Heart Rate Like all heart rate monitoring technologies, accuracy is affected by physiology, location of device, and different movements. Learn more about wear during workouts. What's Included Charging cable Wireless sync dongle Water Resistance Charge HR is sweat, rain and splash proof. However, the device is not swim proof or showerproof. With any wearable device, it's best for your skin if the band stays dry and clean. Care If the band gets wet or if you sweat in it, remove and completely dry the band before putting it back on. Clean the band with a mild soap-free cleanser like Cetaphil or Aquanil. Give your wrist a rest by taking the band off every now and then.Learn more. Materials Charge HR's wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. Charge HR also has a surgical-grade stainless steel buckle. Battery and Power We recommend charging your device every few days to ensure you are always tracking. Battery life: lasts up to 5 days Battery type: Lithium-polymer Charge time: One to two hours Radio transceiver: Bluetooth 4 Environmental Requirements Operating temperature: -4° to 113° F Maximum operating altitute: 30,000 feet Memory Tracks 7 days of detailed motion data – minute by minute. Tracks daily totals for past 30 days Stores heart rate data at 1 second intervals during exercise tracking and at 5 second intervals all other times Syncing Charge HR syncs automatically and wirelessly to tablets, computers and 150+ leading iOS, Android and Windows smartphones using Bluetooth 4 wireless technology. Syncing range: 20 feet Call notifications via Bluetooth 4 Syncing to computers requires Internet connection and USB port Syncing to mobile devices requires Bluetooth and Internet connection Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices