1.46 inches (3.7cms) AMOLED display, 466*466px, Always on display - Yes - Enjoy clear and immersive visuals on its round AMOLED display.Get up to 7 days of battery life & up to 2 days of power with calling activated. (Battery life can vary due to multiple factors such as turning on continuous HR tracking or turning up the brightness. The smartwatch comes with a 300mAh battery that takes approx. 2 hours to fully charge. It is recommended that you use a 5W power adapter. Please avoid using a fast-charging adapter to prevent future watch damage.