DO NOT BUY Charge 4 badly programmed currently the screen is stuck. Plenty of other much cheaper and better versions but avoid Fitbit at all costs. This is relying on the past and it has updated itself to oblivion. It is a bit worse than that, it insists that they have your credit card details even though there is no charge except of course if you want to see their premuim etc etc its a case of "their hand in your pocket"