The Amazfit GTR 2 Smartwatch has the classic look of a traditional watch and is equally well suited for sports and business. It is equipped with all the sensors of a typical, up-to-date fitness tracker: It can measure 24-hour heart rate, monitor sleep rhythm and quality, and also calculate the oxygen content in the blood. All thanks to the BioTracker 2 optical sensor. Another standout feature is the very long battery life, which is up to 14 days with normal use, but can be stretched up to 38 days with minimal use. A good dozen sports modes like running, elliptical trainer swimming, skiing, mountaineering and more help track your health in different conditions. With GPS to help with speed and route guidance, overall you're optimally equipped for any activity; even underwater. To get the most out of the Amazfit GTR 2 as an accessory, there are over 100 watch faces to choose from for the 326ppi AMOLED display. And at home, the Amazfit GTR 2 supports home automation by communicating directly with Alexa.