The over achiever of the pedometer family, the FitBit One tracks not only steps, distance, and calories, but also stairs climbed and how well you sleep! Commit to getting back in shape, and let the FitBit One be your guide. . Tracks steps, distance, calories burned, and sleep quality using a MEMS 3 axis accelerometer for the most accurate data measures stairs climbed using an altimeter. Tracks how long you sleep, how well you sleep, and how many times you wake up. Silicone clip keeps it secure anywhere: pocket, belt, or bra wrist band lets you wear it in your sleep. Fitbit free mobile app and free online dashboard let you see your stats as graphs or charts so you know exactly how close you are to reaching your personalized weekly fitness goals Fitbit helps keep you motivated by awarding badges when you achieve a goal Connect with friends and family on Fitbit.com so you can see each others progress. Rain , splash , and sweat proof so you can wear it all the time just not in the pool unfortunately it is not fully waterproof. Simply press the button on the device face to switch between the six display modes: steps, distance, calories burned, floors climbed, Flower growsshrinks based on recent activity, and clock. Rechargeable Lithium ion polymer battery lasts 5 7 days on a charge. Data syncs automatically and wirelessly to your computer, iPhone 4S or 5, iPod touch 5th generation, or iPad 3rd generation Included wireless USB dongle will initiate sync when Fitbit is within 20 feet of your computer Bluetooth Smart connectivity will sync stats to your phone without killing its battery.