Fitbit Versa 3 Health & Fitness Smartwatch for iOS & Android (FB511) - BlackThe Fitbit Versa 3 Health & Fitness Smartwatch for iOS & Android. Model: (FB511). Black Version. Features: Run, bike, hike and more phone freeand see your real time pace & distancewith built in GPS. Then check out your workout intensity map in the Fitbit app Active Zone Minutes uses your resting heart rate to gauge exercise effort and gives you a buzz when you step up the intensity so you can make the most of your workouts. Fitbit Versa 3 is water