The Fitbit Aria models are Wi-Fi-enabled smart scales that can detect a user's weight, body mass index (BMI), and lean mass or body fat percentage.
Each scale displays the information on its screen before sending the data to the Fitbit servers, where it syncs with the connected Fitbit user’s account. You can view this data on any of the free Fitbit apps in basic charts and visualizations.
Up to eight individuals can use the same Fitbit Aria scale. The smart device automatically detects who is using it by comparing their data to the current person standing on the scale.