Apple Watch SE has a water resistance rating of 50 meters under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. Apple Watch SE should not be used for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depth. Water resistance is not a permanent condition and can diminish over time. For additional information see support.apple.com/en-us/HT205000. The Series 6 also features a new antenna with double the spectrum of the Series 5 that enables it to support 5GHz Wi-Fi for the first time. This can help free up congested 2.4GHz bands, while allowing access to potentially speedier 5GHz bands.

Carbon reductions are calculated against a baseline scenario: 1) No use of clean electricity for manufacturing or product use, beyond what is already available on the grid (based on regional emissions factors). 2) Apple’s carbon intensity of key materials as of 2015 (our baseline year for our 2030 product carbon neutrality goal). Carbon intensity of materials reflects use of recycled content and production technology. 3) Apple’s average mix of transportation modes (air, rail, ocean, ground) by product line across three years (fiscal years 2017 to 2019) to best capture the baseline transportation emissions of our products. It will fit 140-220mm wrists, so if your wrist is on the bigger side, it will definitely be a better option to go for the 44mm one. Irregular rhythm notification requires the latest version of watchOS and iOS. It is not intended for use by people under 22 years old or those who have been previously diagnosed with atrial fibrillation (AF). Apple says it increased the maximum brightness of the display from 200 nits to 500 nits when your wrist is down, which makes it easier to see in the sunlight. That's a welcome addition for me personally, as I live in Florida and spend a lot of time at the beach. And I can attest that the Series 6's screen is noticeably easier to read when I'm outside walking my dog and glance down. The watch uses data from the barometric pressure sensor, GPS, and nearby Wi-Fi networks to determine your exact location and update your elevation on the fly. You can also add your elevation as a complication on the watch face.

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Apple Watch Series 9 has a water resistance rating of 50 meters under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. However, Apple Watch Series 9 should not be used for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depth. Water resistance is not a permanent condition and can diminish over time. For additional information see support.apple.com/en-us/HT205000. The standout feature here is a new sensor that can measure the oxygen saturation of your blood, also known as SpO2. This metric indicates how well your circulatory and respiratory systems are delivering oxygenated blood to your body. Your SpO2 reading alone can't diagnose COVID-19, but as the Yale School of Medicine advises, a reading below 90 percent may warrant a trip to the emergency room. Requires an iPhone and Apple Watch with second-generation Ultra Wideband chip. Ultra Wideband availability varies by region. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charging USB‑C Cable. Testing conducted by Apple in August 2023 using pre‑production Apple Watch Ultra 2 (GPS + Cellular) paired with iPhone; all devices tested with pre‑release software, Apple Watch Magnetic Fast Charging USB‑C Cable (Model A2515) and Apple 20W USB‑C Power Adapter (Model A2305). Charge time varies with region, settings and environmental factors; actual results will vary. The Series 6 also features Apple's signature digital crown on the top right side. Press this button to return to the watch face; press and hold it to talk to Siri; or turn it to scroll, zoom, or adjust.

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. Case and strap combinations can be made within collections (Apple Watch and Apple Watch Hermès) only. Charge times are from 0–80% and 0–100% using the included Apple Watch Magnetic Fast Charging USB‑C Cable. Testing conducted by Apple in August 2022 using pre‑production Apple Watch Ultra (GPS + Cellular) paired with an iPhone; all devices tested with pre‑release software, Apple Watch Magnetic Fast Charging USB‑C Cable (Model A2515) and Apple 20W USB‑C Power Adapter (Model A2305). Charge time varies with region, settings and environmental factors; actual results will vary.

The first time you open the Blood Oxygen app on the watch, it takes you through some helpful tips to get a good reading. Apple says your watch band should be snug but comfortable, and to make sure the watch isn't too low on your wrist. You should keep the watch facing up and try not to move during the reading. Resting your arm on a table can help. ECG app is available on Apple Watch Series 4 and later (excluding Apple Watch SE) and can generate an ECG similar to a single-lead electrocardiogram. Intended for use by people 22 years old and over. Apple Watch Ultra 2 has a water resistance rating of 100 meters under ISO standard 22810. It may be used for recreational scuba diving (with compatible third-party app from the App Store) to 40 meters and high-speed water sports. Apple Watch Ultra 2 should not be used for diving below 40 meters. Water resistance is not a permanent condition and can diminish over time. For additional information see support.apple.com/HT205000. Emergency SOS requires a cellular connection or Wi-Fi calling with an internet connection from your Apple Watch or nearby iPhone.