Track your way to real results - Automatically detects up to six exercises, while tracking up to 39 more, right from your wrist. Resolve to rest better - Helps you analyze your sleep patterns and encourages you to wind down to keep you refreshed and at your best. Sends you real-time alerts if ever detecting a high or low heart rate, so you can be more proactive about your heart health. Expand your Galaxy - Sync with your phone to stream your playlist, get notifications and more, right on your wrist. Thin. Light. Durable - A thin, lightweight and durable swim-ready design comes in a variety of colors and interchangeable bands.