vívosmart HR+ activity tracker uses Elevate wrist heart rate technology to monitor heart rate at the wrist 24/7. That gives you the freedom to work out however you want, with no additional heart rate strap needed. Using heart rate, vívosmart HR+ provides calories burned information. Whether you're going for a jog, playing a pick-up game with friends or trying out a new boot camp class, it quantifies the intensity of your fitness activities using intensity minutes. This feature lets you monitor your progress against activity goals recommended by health organizations such as the American Heart Association, U.S. Centers for Disease Control and Prevention and the World Health Organization. Additionally, you can use your vívosmart HR+ as a heart rate strap on your wrist when paired with other compatible Garmin devices.