FitBit Charge. Band is a large 6.5”-7.7” Energize your day with Charge—an advanced activity wristband that tracks your steps taken, distance traveled, calories burned, floors climbed and active minutes. Stay connected throughout the day with real-time fitness stats and Caller ID on the OLED display. And when the day is done, automatically monitor your sleep and set a silent, vibrating alarm. Whether you’re at the office or on the go, Charge wirelessly syncs your stats to your smartphone and computer to help you find the motivation you need to achieve your goals. Activity Tracking Caller ID Auto Sleep + Silent Alarm Exercise Tracking OLED Display All-Day Wear