Behold the power of heart rate on your wrist with the Fitbit Charge Wireless Heart Rate Activity Wristband. This smart watch has a PurePulse heart rate monitor to give you continuous, automatic, wrist based heart rate and simplified heart rate zones that sync wirelessly to your smartphone. Also monitoring your workouts, distance, calories burned, floors climbed, active minutes and steps taken, this watch syncs your stats wirelessly to your smartphone or computer from up to 20ft away, displaying your progress in easy to read charts and graphs. The sleep monitor helps you get your REM cycle dialed and the silent alarm gets you up and at 'em without disturbing anyone in bed with you. For those on the go, the OLED display screen shows caller ID and other notifications from your phone, as well as your daily stats and the time of day. The lithium polymer battery lasts up to five days to keep you on the right path and your workouts consistent.