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.
Not only does it sync to my phone but also to MyFitnessPal app. It is very accurate. I do love it, but it does have 2 flaws. I am not happy with the exercise portion. Even though I have it set to track my exercise activity it does not! It does give you the option to manually set it in BUT it only allows u to do walking, running and Hiking... I am a gym person so as I add this in it isnt quite right so I took a star away. Flaw 2 is most of the food I type in or scan doesnt pop up so negative another star. Gladly it links to the MFP so I use that and it automatically syncs into the Fitbit app on my phone. Def tracks you steps well and has an almarn which is helpful when i need reminders for my vitamins