About this item Get ready to crush your wellness goals with body readings right on your wrist. Better Sleep Starts Here: Wake up feeling refreshed and recharged with advanced sleep tracking; When you go to bed, your Galaxy Watch4 sleep tracker starts monitoring your sleep and SpO2 levels continuously. Be Smart About Your Heart: Take care of your heart with accurate ECG monitoring and keep an eye on possible atrial fibrillation, a common form of irregular heart rhythm; Share personalized readings with your doctor using the Samsung Health Monitor app on your compatible Galaxy phone. Samsung Silicone Watch band for Comfort and active lifestyle Compatible with Samsung Galaxy Watch 4 and Galaxy Watch 4 Classic