The world's most advanced tracker. The most advanced activity tracker known to man, UP3™ is packed with state-of-the-art sensors that give you the full picture of your health. Heart Health Sensor measures resting heart rate - a leading indicator of your overall health and fitness level. Workouts are automatically recognized and logged. You'll gain an in-depth understanding of your sleep. All this, in an impossibly small, water-resistant design with a full week of battery life. So you'll need to recharge before UP3™ ever does. There’s more to your heart health than beats per minute. Our advanced bioimpedance sensors are able to automatically track your resting heart rate and use that information to help you take care of the most important organ in your body. Smart Coach Because the UP3™ band captures so much information, Smart Coach is even smarter. It uses everything it learns about your activity, sleep, food and resting heart rate, so it can give you deeper insight and more personalized tips to reach your goals faster. Advanced Sleep UP3™ uses advanced sensors to track your true sleep stages - REM, Light, and Deep. Smart Coach is then able to give you suggestions to maximize your sleep and improve the quality of your days. Advanced Activity The more you do, the smarter UP3™ becomes, by learning to recognize and automatically log all your activities from running to a pickup game of basketball. Smart enough to know what you're doing, UP3 gives you a detailed picture of your calorie burn.