N°1 WORLD - Withings Invented the smart scale ADVANCED WEIGHT TRACKING - Visualize your progress with each weigh-in with your weight curve and BMI display to help you see the big picture and make sure you're on track. MULTI-USER - Personalized recognition of up to eight users who can weigh themselves and access their weight history FOR EVERY STAGE OF LIFE - Follow the growth of the whole family with Pregnancy Mode (ranges for healthy weight gain and advice from an obstetrician) and Baby Mode, to keep up with your little ones. PATENTED POSITIONING AID TECHNOLOGY - The exclusive Position Control technology guides you to take the optimal position so that each weighing is accurate to within 0.1 kg/0.2 lbs. AUTOMATIC DATA SYNCHRONIZATION - The data from each weighing is automatically displayed via WIFI or Bluetooth in the Health Mate app. HIGH COMPATIBILITY - Syncs with Apple Watch and over 100 health and fitness apps, including Apple Health, Fitbit, and Google Fit LONG-LASTING BATTERY - Enjoy up to 18 months of battery life with four standard AAA batteries (included) "ALEXA, ASK WITHINGS ” - Now your voice can help you manage your weight with the Alexa skill associated with Health Mate The products Withings on Amazon should be "shipped and sold” Amazon or Withings so that you can benefit from the warranty/replacement by Withings