Fitbit Alta Activity Tracker: Maintain a healthy, active lifestyle with help from this wireless activity tracker, which tracks your steps, distance, calories burned, active minutes and sleep patterns for 24/7 monitoring. A wireless sync dongle is included for easy connectivity to your Windows, Apple or Android device.
this is a great tool for tracking steps, food, water and activities. The only thing that isn't perfect is sometimes when I double tap to view time it doesn't come up the first time or when I turn my wrist to view time, it doesn't come up. other than that it is a great product