Only used once Comes with charger The Garmin Forerunner 965 is a GPS smartwatch that provides a comprehensive look at your health and workout data. It has an AMOLED screen, accurate GPS, and heart rate variability. The Forerunner 965 can last up to 23 days in smartwatch mode, but regular use and activity tracking may reduce the battery life. It also has an altitude acclimation widget that uses your blood oxygen data to tell you how well you've adjusted to the altitude or heat.