The Garmin Index S2 Smart Scale measures your weight, body mass index, muscle mass, bone mass, and body fat and body water percentages. Whether you're in training or simply trying to maintain a healthy weight, the scales help you monitor your progress with ease. The scales connect to your home WiFi, so you can wirelessly sync your data to the Garmin Connect app. Compatible with iOS and Android, the app lets you see your data in more detail and track your progress towards your goals. It will even show you today's weather to help you plan your day. You can program the Index S2 to automatically recognise up to 16 people. Each person's body composition metrics are uploaded directly to their own Garmin Connect accounts, letting them check their own health data any time.