This device comes with two AAAbatteries included which means you don’t have to go out and buy any more. And this SOPHIE app is free so you can keep track of your progress (it also works with Fitbit)!With just one touch of a button; you’ll see your progress in every report section: Weight; Physical Wellness Score (PMS); Muscle Mass Index (MMI) and Body Age Report. And that’s not all… This product also comes with a Workout Buddy feature which lets you set goals for yourself and track those achievements with precision through its online database!Product Details:Hands Free – no need to look for your phone every time; 'Sophie' stores your stats for you. Just step on it now; and track the stats later.Auto Transfer – whenever you open our 'Feelfit' APP; your previous stored stats will be automatically transferred to your phone. It’s that easy.Unlimited User Profiles – create multiple accounts in one APP; keep track of the wellness of your entire family.Kid Friendly – you will be surprised how much 2 year old’s love 'Sophie'. My baby boy does not go to bath without standing on it first.Watch their growth – 'Sophie' really helps to record the growth of the young members of your family.'Feelfit' APP – our free iOS/Android APP that works best with 'Sophie'. You may also record the stats with Apple Health; Google Fit; Fitbit; and etc.Workout Buddy– 'Sophie' keeps track of your progress towards your fitness goal; like a coach.