The Fitbit Versa 3 has an always-on AMOLED display, built-in GPS, blood oxygen and temperature tracking during sleep, and a battery that lasts up to six days. It also features an indented haptic side button, an easier band-swapping mechanism, and heart rate zone notifications during workouts. Additionally, it can estimate your Vo2 max (maximum oxygen consumption during exercise) and has access to guided workout programs and videos with a Fitbit Premium subscription.