The powerful 3-in-1 Samsung Bio Active sensor controls three health sensors effectively. Bioelectrical Impedance Analysis sensor, Electrical Heart sensor (ECG), and Optical Heart Rate sensor. Know your sleep with our new and improved sleep tracking technology. Plan your bedtime, detect snoring, understand and track your sleep stages (awake, light, deep, REM) via 8 animal sleep symbols representing your sleep type. Better nights lead to better days. Monitor everything from body fat percentage (BIA) to skeletal muscle weight. All the personal feedback you need to track your progress to a healthier you. Working out? Your watch counting your steps, calories, and even your routines. It even supports over 90 exercises that you can track from your watch. Up to 45% charged in 30min It takes about 30 minutes to go from 0% up to 45% charge. Yes, you read that right. With a bigger battery than its predecessors and fast charging, you're ready to go in no time.