Fitbit charge wireless activity and sleep wristband tracks steps, distance, calories burned, floors climbed and active minutes. See daily stats, time of day & Exercise Mode on the OLED display. Also, you can see call notifications on display with compatible mobile devices, It lasts 7-10 days. It sync stats wirelessly and automatically to leading smartphones and computers, charge lets you see your progress on-the go, and shows you detailed charts and graphs so you can track your trends over time.