Primed for action, the battery of the GTR 4 packs a 475 mAh rated value, and the watch's new battery saver mode even enables continued use of features like sports modes, measurement of health metrics, and more, all while saving power. Enjoy highly accurate 24-hour monitoring of heart rate, blood oxygen saturation, and stress levels. The watch can also detect your breathing rate and is able to quickly measure these four important health metrics in one easy tap. The GTR 4 can automatically recognize the movements and count the reps of dozens of strength training exercises, many of which have adjustable variations in the Zepp app, as well as track your rest time between sets.