Just step on this advanced clinically tested smart scale for instant feedback and highly accurate weight & weight trends, BMI, advanced full body composition (body fat and water percentage, plus muscle and bone mass), visceral fat index and cardiovascular insights to help you stay on top of your health. Every weigh-in appears in the Withings app automatically, via Wi-Fi or Bluetooth sync. And unlike many smart scales, with Wi-Fi sync, you don’t have to have your phone with you when you weigh-in to synchronize your data.