No matter your level of activity, the Garmin Index Smart Scale gives you the information you need to track your progress and help you get the results that you want. The Garmin Index Smart Scale measures your: Weight Body mass index (BMI) Body fat Water percentage Bone mass Muscle mass Smart is the word You can see and analyse your results in detail on the free online fitness community - Garmin ConnectTM. You can connect your Garmin Index Smart Scale via wi-fi to your computer or compatible smart phone. Up to 16 different people can be recognised and have information sent to their individual Garmin Connect accounts. Battery life: Up to 9 months; uses 4 AA batteries (included) Bluetooth Smart (BLE) capable ANT+ compatible WiFi connected (2.4GHz 802.11 b/g/n) Product weight: 2.8kg In the box: Index Smart Scale 4 carpet feet 4 x AA batteries Documentation