These scales offer a wide range of measurement data including weight, body fat, water, muscle and bone density. When the phone is nearby and the app is open it syncs the measurements quickly. The app is easy to use and all of the information is laid out nicely. The weight and BMI seem to be accurate however I found that the body fat percentage was quite different to what the Fitbit Aria says so I'm not completely sure about the accuracy there. Overall very happy with the product.