SIZE BEFORE YOU BUY: Galaxy Ring sizes differ from standard ring sizes; Purchase the Samsung Galaxy Ring Sizing Kit on Amazon first, and receive a $15 Amazon credit towards your future Samsung Galaxy Ring purchase (terms and conditions apply)\nLESS CHARGING, MORE TRACKING: Live your life with a Galaxy Ring that’s got your back; Hour after hour, day after day, Galaxy Ring keeps tracking without needing a charge for up to seven days; making it perfect for active lifestyles\nTRACK YOUR HEALTH. GET YOUR SCORE. OWN THE DAY: Learn how ready you are to take on the day using Energy Score with Galaxy AI; It calculates your physical readiness based on yesterday\\\'s sleep, heart rate and steps - all with no app subscription\nREMARKABLE DESIGN. EVERYDAY DURABILITY: This Galaxy Ring is built for your everyday — a concave design minimizes scratches for outstanding durability; Plus, Galaxy Ring isn’t afraid to take a splash — it’s water resistant\nTRACK YOUR HEART HEALTH RIGHT FROM YOUR FINGER: Get a closer read on your body than ever before with improved Heart Rate Tracking from Galaxy Ring; It filters out your body’s movement for a more precise reading