PRODUCT OVERVIEWCrush workouts and all your health goals with Samsung Galaxy Watch4. Be your best with the watch that knows you best.KEY FEATURESBODY COMPOSITION ANALYSIS: Galaxy Watch4 is the first smartwatch to off body composition data right on your wrist, On your own schedule, now you can get readings on body fat, skeletal muscle, body water, basal metabolic rate, and Body Mass Index.Supported Application: Fitness Tracker, GPS, Sleep Monitor. Connectivity technology: Bluetooth, Cellular GPS. Wireless comm standard: BluetoothBETTER 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 continuouslyBE 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 phoneMAKE EVERY WORKOUT COUNT: Get the most out of every exercise session with advanced workout tracking that recognizes 6 popular activities, from running to rowing to swimming, automatically in just 3 minutes; Stay motivated by connecting to live coaching sessions via your smartphone or dynamic Group Challenges with your friendsGO THE EXTRA MILE: Improve your runs with advanced running coaching technology; VO2 Max readings assess your oxygen levels to manage and track your heart and lung enduranceEXTENSION OF YOUR PHONE: Put the phone features you need right on your wrist and stay connected to calls, texts, notifications, and music streaming, all accessible with a simple tapGOOGLE ON YOUR WRIST: Tap into the power and convenience of select Google services and apps right from your wrist; Pay for coffee; Get directions to the park; Use Bixby or Google Assistant for help on almost any topic; Stream your favorite tunes on YouTube