Operating system Android, iOS Special features GPS, Heart Rate Monitor, Notifications Connectivity technology Bluetooth Battery cell composition Lithium Ion GPS Built-in GPS About this item WHY APPLE WATCH SE—All the essentials to help you be motivated and active, keep connected, track your health, and stay safe. The Smart Stack and redesigned apps in watchOS 10 help you see more information at a glance. With features like Crash Detection2 and enhanced workout metrics, Apple Watch SE is a better value than ever. CARBON NEUTRAL—Pair any aluminum Apple Watch SE with a Starlight, Midnight, or Winter Blue Sport Loop for a carbon-neutral combination. CELLULAR CONNECTIVITY—Send a text, make a call, and stream music and podcasts without your iPhone nearby. Add a cellular plan to stay connected in more places than ever. HEALTH AND SAFETY FEATURES—Get help when you need it with Fall Detection, Crash Detection, and Emergency SOS. Get deep insights into your health, including notifications if you have an irregular heart rhythm or an unusually high or low heart rate. SIMPLY COMPATIBLE—It works seamlessly with your Apple devices and services. Unlock your Mac automatically. Find your devices easily. Pay and send money with Apple Pay. Apple Watch SE requires iPhone XS or later with iOS 17 or later. SWIMPROOF AND STYLISH—Water resistance rating of 50 meters. Three finishes. And a color-matched back case made with a production process that reduces its carbon emissions. EASILY CUSTOMIZABLE—With watch bands in a range of styles, materials, and colors and fully customizable watch faces, you can change your watch to fit your mood or the moment. A POWERFUL FITNESS PARTNER—The Workout app gives you a range of ways to train plus advanced metrics for more insights about your workout performance. And Apple Watch comes with three months of Apple Fitness+ free. STAY CONNECTED—Send a text, take a call, listen to music and podcasts, or call for help with Emergency SOS. Apple Watch SE (GPS) works with your iPhone or Wi-Fi to keep you connected. ADVANCED HEALTH FEATURES—Get notifications if you have an irregular heart rhythm. See how much time you spent in REM, Core, or Deep sleep with sleep stages. And take note of your state of mind to help build emotional awareness and resilience.