Put on the heart rate monitor, which activates the device's sensors. (It will only communicate if you wear the gadget.) Bring the gadget as close as possible to the sensor. Press the action button (button on the right side of the device). The device will start tracking your heart rate. That's it! The VivoActive monitor will track your heart rate throughout the day, showing trends that may help prevent illness or injury. For example, if your heart rate is high for long periods of time, this might indicate that you are at risk for a heart attack or other cardiovascular disease. If you know about any health problems, make sure to tell your doctor about them. They can help ensure that the monitor provides accurate readings that will help keep you safe. The VivoActive monitor has several advanced features to help improve your overall health and fitness. · It can measure the impact of exercise on your heart by recording how long its beats stay steady after you have stopped moving. This is called "post-exercise recovery" and is an important indicator of your cardiac health. · It can also measure the quality of your sleep by analyzing the pattern of movements it detects during the night. Sleep experts use these patterns to determine how well you were asleep.