KNOW YOUR SLEEP SCORE — Sleep score provides an easy way to help track and understand the quality of your sleep, so you can make it more restorative. EVEN MORE HEALTH INSIGHTS — Take an ECG anytime. Get notifications for a high and low heart rate, and an irregular rhythm.View overnight health metrics with the Vitals app and take readings of your blood oxygen. STUNNING DESIGN — Thin and lightweight, Series 11 is comfortable to wear around the clock — while exercising and even when you’re sleeping, so it can help track your key metrics. A POWERFUL FITNESS PARTNER — With advanced metrics for all your workouts, plus features like Pacer, Heart Rate Zones, training load, Workout Buddy powered by Apple Intelligence from your nearby iPhone, and more. BIG BOOST IN BATTERY LIFE — With up to 24 hours of normal use. And fast charge for up to 8 hours of normal use in just 15 minutes.