I don't know how I ever lived without the Fitbit Flex 2 Swim Proof Activity Tracker! I love it. This is my first experience with any type of fitness tracker. I'm glad I started with this one (hopefully it will last a long time!) This system comes with two wristbands (small and large), a charging cable, and the tracker. It works with IOS, Android and Window devices. It is simple to set up/charge. Once the tracker is charged, just slip it into the wristband. The wristband is extremely comfortable and lightweight, you will not even notice you're wearing it. Once you install the app, follow instructions on setting up any type of program or schedule of your choice. It is very simple, and you will be amazed at how active (or inactive) your are. It even notifies you when you get a text or email on your phone. Fitbit offers a one to two year warranty, depending on normal wear and tear.