FeaturesVoice calling & voice commandsContactless payments via Apple PayMeasure your blood oxygen & check your heart rhythmHealth & fitness tracking with heart rate monitor & GPSBattery life: up to 18 hoursThe Apple Watch Series 6 GPS lets you measure your blood oxygen level with a revolutionary new sensor and app. Take an ECG from your wrist. See your fitness metrics on the enhanced Always-On Retina display, now 2.5x brighter outdoors when your wrist is down. Set a bedtime routine and track your sleep. And reply to calls and messages straight from your wrist. It’s the ultimate device for a healthier, more active, more connected life.Blood Oxygen app measurements are not intended for medical use, including self-diagnosis or consultation with a doctor, and are only designed for general fitness and wellness purposes.The ECG app and irregular rhythm notification require the latest versions of watchOS and iOS, and are not intended for use by people under 22 years old. The ECG app is available on Apple Watch Series 4 or later. The irregular rhythm notification is not designed for people who have been previously diagnosed with atrial fibrillation (AF).ISO standard 22810:2010. Appropriate for shallow-water activities like swimming. Submersion below shallow depth and high-velocity water activities not recommended.To use Emergency SOS, your iPhone needs to be nearby. If your iPhone isn’t nearby, your Apple Watch needs to be connected to a known Wi-Fi network and you must set up Wi-Fi Calling.