Apple Watch Series 7 - Technical Specifications - Apple Support
https://support.apple.com/en-us/111909
WebMar 24, 2022 · Features. GPS, GLONASS, Galileo, QZSS, and BeiDou. Compass. Always-on altimeter. Water resistant. 50 meters1. Blood oxygen sensor. (Blood Oxygen app)2. Electrical heart sensor. (ECG app)3. Third-generation optical heart sensor. International emergency calling 5. Emergency SOS 4.
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