The Forerunner 265 Series is available in two sizes (the 42mm Forerunner 265S and the 46mm Forerunner 265). The 265S has a battery life of up to 24 hours in GPS mode and up to 15 days in smartwatch mode; the 265 has a battery life of up to 20 hours in GPS mode and 13 days in smartwatch mode. Pulse Ox sensors, “Body Battery” energy monitoring, sleep and stress tracking, menstrual cycle monitoring, and pregnancy tracking are all included in both watches. They also track V02 max (the maximum amount of oxygen you can use per minute based on your weight), performance condition, and other variables. Lastly, it provides two adaptive training options: daily advised exercises based on future race information and video series from your favourite Garmin instructors.
