Garmin Vivosmart activity trackers measure your general health and daily activities. They're thin and minimalist, so you can comfortably wear it around your wrist. Connect the tracker to your smartphone to receive your messages on the watch. It also analyzes your steps, distance, and sleep in the Garmin Connect app on your smartphone. The Garmin Vivosmart is available in 2 sizes, S/M and L. Choose the size that fits your wrist circumference. You can find this information on the product page.