Features o Tempered glass platform o Size H30x W30x D2. 57cm o Batteries required: 3 x AAA batteries (included) o Capacity 180kg (28st 5lb) o Suitable for hard surfaces o Goal weight tracker o Weight 1. 79kg. Get a more complete picture of your health with the Fitbit Aria Air smart scale. This easy to use smart scale displays your weight and syncs it to the Fitbit app where you can view your BMI, track your trends over time and see how things like activity and nutrition impact your goals. In a single step, Aria Air tracks your weight and syncs your stats to the Fitbit app where you can see your BMI based on your weight and profile information.