The FitBit measures your steps, converts to miles per week, accounts your calories against your current weight calories and lets you know the difference, it sends you an email when the battery needs to be charged, you can shower in it, you can set an alarm to wake you....it lightly buzzes/vibrates to wake you....if you go back to sleep, it knows and sends the vibration again....it also tracks your sleep habits....you put in your going to bed time and waking up time and it shows you how many times you woke up in the middle of the night...it is cool. $89 at Bed Bath and Beyond....great investment for someone tracking activity and calories. On tracking calories, you start to type in the food, it automatically give you a long list of that item, select the one that fits your food and press a button, it gives you the calories, protein, carbs, fat breakdown on screen....fabulous! Worth the price