PurePulse™ Heart Rate Gives continuous, automatic, wrist-based heart rate & simplified heart rate zones. Learn more Workouts + All-Day Activity Track workouts, heart rate, distance, calories burned, floors climbed, active minutes & steps Exercise Tracking Get real-time run stats & review routes, splits and workout summaries on the app SmartTrack™ Automatically recognizes select activities and records it in the exercise section of the Fitbit app Auto Sleep Tracking & Silent Alarms Monitor your sleep automatically & set a silent alarm Caller ID + Watch See daily stats & time of day, and get call notifications with compatible devices Wireless Syncing Sync stats wirelessly & automatically to leading smartphones and computers Battery life: lasts up to 5 days Battery type: Lithium-polymer Charge time: One to two hours Radio transceiver: Bluetooth 4.0 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 Water Resistance Spill proof and Splash proof but Not suitable for Swimming

What's Included: Charging cable Wireless sync dongle Sensors & Components Optical heart rate monitor 3-axis accelerometter Altimiter Vibration motor Display OLED Heart Rate 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 Fitbit Charge HR's wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. Fitbit Charge HR also has a surgical-grade stainless steel buckle. Environmental Requirements Operating temperature: -4° to 113° F Maximum operating altitude: 30,000 feet