Tracks all day activity. Long battery life up to 8 days. Animated clock face characters. Sleep tracking. Fitbit app schedules bedtime reminders and silent alarms. Swimproof design. Enjoy family challenges with fun step competitions. Virtual badge incentives. Reminders to move and stretch the legs. On-wrist timer and stopwatch features. Adjustable silicone band with secure buckle closure. Strap is interchangeable with compatible bands. Includes charging cable. Band fits wrists 4.8" to 6.8" in circumference. Recommended ages 6 years and up.