Body Composition Analysis Get ready to crush your wellness goals with body readings right on your wrist.   Advanced Sleep / Continuous SpO2 Manage your overall sleep quality for a great night's sleep with an advanced tracker that calculates your sleep score.   ECG Be smart about your heart with ECG Monitoring that gives accurate readings.   Fitness / Auto Workout Tracking Make the most of every workout with Auto Workout Tracking. Stay motivated by connecting to live coaching sessions via your smartphone or to dynamic Group Challenges with your friends.   V02 Max / Advanced Run Coaching Make the most out of every mile with Advanced Run Coaching and VO2 max readings to assess your cardio levels.   Extension of Your Phone Stay in stride while staying connected to calls, text and music on the go.   Upgraded OS (GSuiteApps) Tap into the power and convenience of select Google services and apps on your wrist.   Sleek and Lightweight Design Look great while crushing every part of your day with the sleek, lightweight and customizable design.   Group Challenges Get moving and motivated with your family and friends. Join the fitness fun with activities and challenges designed just for groups.   Trip Detection Get peace of mind while on the go with Trip Detection that sends an SOS to your emergency contact in the event of a hard fall.   Women’s Health Galaxy Watch4 helps women build a deeper connection with their bodies and their health by helping to log and track fertility windows, ovulation cycles and periods.   Samsung Health Samsung Health helps you stay on top of your health, your goals and upcoming fitness needs.   Payments Tap. Pay. Go. Samsung Pay and Google Pay make quick stops even quicker.   SmartThings Cool down the house as you cool down from your workout with a tap of your wrist.   Ecosystem Breeze through your fitness goals by pairing your compatible Galaxy devices and by connecting to your fitness community.   Size 44.4mm x 43.3mm x 9.8mm