Monitor your body composition and wirelessly sync health data to a free online app with the black Aria Air Wi-Fi Smart Scale from Fitbit. The Aria Air displays your weight and syncs it to the Fitbit app where you can view BMI, track trends over time, and more. Works With Fitbit App: See your progress over time and get the motivation to keep pushing towards your goals. Easy Smartphone Setup: Set up your scale in minutes using your smartphone's Bluetooth wireless technology and following the quick start guide. Tracker Compatible: Works with Fitbit smartwatches and trackers so you can get a better understanding of how your activity impacts your weight. Syncs Wireless via Bluetooth: Using your smartphone's Bluetooth wireless technology, sync your stats to your Fitbit account where they are compiled into simple charts and graphs that let you see your progress over time. Multiple Users: Allows multiple users to measure their weight when their phone is connected to the scale. Charts + Graphs: See your trends and track progress in easy-to-read charts & graphs on the Fitbit dashboard. Simple and Accurate: Track your weight and sync your stats to the Fitbit app where you can see your BMI based on your weight and profile information. Compatible with Apple iOS 12.2+, Android OS 7.0+, Windows 10 Version 1607.0+.