Includes: Fitness Tracker, Charger, original black band, stretch black band (new) sz small, sm sport band (worn but good to have as an extra) & box. Tracker works with free Fitbit app which allows you to input your food for the day and then compares it to your calorie burn for the day. Great way to maintain or support your weightloss journey! Features & details -Track all day activity, including steps, distance, hourly activity, active minutes and calories burned -Automatically track your sleep & set silent alarms that wake you by buzzing on your wrist. -5 days of battery for daily progress without constant charging -Automatically and conveniently record workouts like walks, swimming & bike rides with smart track -On screen dashboard, intuitive touchscreen & backlit display -Acknowledge milestones on your journey with on screen celebrations when you hit your activity goals