Experience the ultimate convenience with the Galaxy Watch 4 released in 2021, featuring a vibrant Super AMOLED display available in 40mm / 44mm sizes, powered by the Exynos W920 processor and running on Wear OS. Stay connected and healthy with Built-in GPS, Optical HR sensor, SpO2 tracking, region-dependent ECG, advanced sleep tracking, 5 ATM and IP68 water resistance, and a reliable battery lasting around 1-2 days depending on use.