Product Description Energize your day with the Fitbit Charge Wireless Activity + Sleep Wristband. This fitness watch monitors sleep and tracks steps taken, distance traveled, floors climbed, and calories consumed and burned. Sync your stats wirelessly to your smartphone or computer from up to 20ft away and view your progress in easy-to-read charts and graphs. See daily stats, time of day, day of the week, and exercise mode on the OLED display, as well as who's calling you with the synced caller ID feature. Get the most out of your R. E. M. cycle with the sleep monitor to see just how long and how well you're sleeping throughout the night. The unremitting battery lasts 7-10 days, while this tough timepiece is splash and rain-proof to keep you crushing your goals, even in inclement weather. From the Manufacturer •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 Buying Guide Move it up: Since blood increases further up your arm, wear your tracker higher on your wrist to improve the heart rate signal during workouts. Start by moving the device up to three finger widths above your wrist bone, then experiment with slightly lower placement. Keep it secure: The less your tracker moves during exercise, the more chance you have of maintaining a heart rate signal throughout the activity. Do not wear the band too tightly, as this can restrict blood flow and goes against our wear and care guidelines. Hold steady for ten seconds: High intensity exercises or activities that cause you to keep your wrist bent (like push-ups) or move your arms vigorously (like dance) may interfere with heart rate signals. If you stop seeing a signal during these types of activities, hold your wrist steady for ten seconds during breaks to get your reading. Manufacturer Contact Information Customers contact: [email protected] See more