It's a brand new smart scale. REDOVER-Bluetooth Body Fat Scale with Free iOS & Android App, Smart Wireless Digital Bathroom Scale, Body Composition Analyzer for Body Weight, Body Fat, Muscle Mass, BMI, BMR and More, 400lb (white). Features & details 13 ESSENTIAL HEALTH MEASUREMENTS: Download APP by scan the QR code in the instruction manual, connect with Bluetooth, syncs with Fitbit, Apple Health and Google Fit, measure 13 essential health indicators: Weight, BMI, Body Fat, Body Water, Skeletal Muscle, BMR, Fat-free Body Weight, Subcutaneous Fat, Visceral Fat, Muscle Mass, Bone mass, Protein, Metabolic Age. FAMILY MEMBERS AND FRIENDS SHARING: Available to add unlimited users on one device. Family members and friends can share data with each other to reach a healthier life together STEP-ON TECHNOLOGY: Show weight immediately with step on. Auto-off in few seconds with no stepping. Auto-calibration. Remind low battery and overload. Use BIA technology with 4 high precision sensors to provide accurate readings. Measurement range from 0.4 – 400lb. Measurement Resolution is 0.2 lb. Switch units with kg and lb UNIQUE DESIGN: Special design with professional tempered glass and 3.3 inch highlight LED Display with large and bright reading numbers. WARRANTY AND SUPPORT: REDOVER as an US domestic brand, guarantee high quality products and satisfying services. FREE 5-YEARS WARRANTY and LIFETIME technical support BY REDOVER, 30 days free exchange or return without any reasons