In the Health app on your iPhone, you can view a record of all your measurements and see graphs of your blood oxygen level readings for the day, week, month, or year. It also shows your range and daily average, and you can filter the data to show just your SpO2 level in high-elevation environments or while sleeping.

Apple defines its restrictions on harmful substances, including definitions for what Apple considers to be “free of”, in the Apple Regulated Substances Specification. Every Apple product is free of PVC and phthalates with the exception of AC power leads in India, Thailand (for 2-pin AC power leads) and the Republic of Korea, where we continue to seek government approval for our PVC and phthalates replacement. With all the settings turned off you’ll get comparable battery life to the Apple Watch SE, but with more longevity during workouts or listening to music. Well, the simple answer is: it's a nice thing to have to stay informed. If you're seeing a drop in SPO2 often at the same time as feeling other ill effects, you can head to the doctor to put your mind at rest. If you're at elevation, and suddenly the oxygen saturation level in your blood drops, you can make a decision.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. 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. The final thing we tried was the Watch App Store, to see if it had progressed in the last year. In some ways it has, with there being more Apple Watch apps available than ever – but the opening screen of the App Store on the Watch makes you feel like there’s not much there.

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. There’s no information on whether you spent time in deep sleep, light sleep or REM, nor any correlation with bedtimes, or how stressed you were during the day –these are fast becoming standard features on other fitness wearables, so we expected more from Apple here.Apple Fitness+ requires iPhone8 or later with iOS16.1 or later or Apple Watch Series3 or later with watchOS7.2 or later paired with iPhone 6s or later with iOS 14.3 or later.

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 transport modes (air, rail, sea, land) by product line across three years (fiscal years 2017 to 2019) to best capture the baseline transport emissions of our products. 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.Let's start with one of the oddest things Apple does: it constantly under-represents the battery life of its Watch range. Since the very first model of Watch, the claimed battery life has always been far too stingy – Apple calls it 'all-day battery life', and pegs the Watch 6 to last 18 hours in general use. The ECG app and irregular rhythm notification require the latest version 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 (not including Apple Watch SE). The irregular rhythm notification is not designed for people who have been previously diagnosed with AF. Emergency SOS requires a cellular connection or Wi‑Fi calling with an internet connection from your Apple Watch or nearby iPhone. But you still need to work out when you’re going to find that 90-minute window each day to charge your Watch, if you’re not going to do it overnight, which is frustrating. Case and strap combinations can be made within collections (Apple Watch and Apple Watch Hermès) only.