Body Composition Analysis: Know your body, own your body. With the built-in BioActive Sensor, measure your body’s fat percentage, skeletal muscle, body water and more. Level up your fitness game straight from your wrist. Health comes first: Get Blood Pressure and ECG readings, all from a twist of your wrist. It’s a watch that’s watching out for you. Sleep monitoring: Call the night off with the most holistic sleep analysis. Make it a good night, every day. Fitness: Go beyond listening to your body, know it. It’s fitness within arm’s reach. Compatibility: Your Galaxy Watch4 Classic comes with Wear OS powered by Samsung, helping you connect and play along well with Galaxy devices. Experience the best, right from your wrist.