Why do you need a RENPHO Bluetooth body weight scale? RENPHO body fat scale utilizes advanced BIA (Bio-electrical Impedance Analysis) technology to calculate 13 key body composition metrics (body weight . BMI . body fat% . water % . skeletal muscle . fat-free body weight . muscle mass . bone mass . protein . BMR . subcutaneous fat . visceral fat . and metabolic age). Give you accurate and consistent data. This digital smart scale shows body weight only. 13 body metrics are synced via Bluetooth and stored in the Renpho Health App . so you can get a complete picture of your health. You can set a goal for muscle gain/diet/fitness progress on the app . digital scales for weight gives you an overview of your body and tracks your progress by day . week . month and year and allows you to share on third-party social media platforms . review changes and post experience with other users. One weighing scale for whole family . support for adding unlimited users. Unique baby mode makes it easy to weight your baby or pet.