I got a Misfit Shine in January and love it. I have been meaning to buy the necklace for it, but I haven't yet. I don't have to have it, but it would go better with dress clothes then. I doesn't need to charge, you have to change a battery when it dies, which is supposed to be 6-8 months, it's just a cheap watch battery. It tracks sleep, activity, and syncs with my fitness pal, and can also function as a watch. It's my first tracker, and I love it.